[GeoffR]

Here are template patches for the three different keyboard layouts. I am assuming the layouts haven't changed, so let me know if they have.

To create a keyboard patch just replace the right-most value in each of the replace_string lines. Only 1- or 2-byte characters can be used, so keyboards for some languages are not possible.

Layout for Mini/Touch/Glo/Aura:

æ œ þ š ž ŀ ƒ μ ª º
à è ì ò ù á é í ó ú ý
â ê î ô û ä ë ï ö ü ÿ
  ã ñ õ å ß ç đ ø ij ł

`Keyboard template - Mini/Touch/Glo/Aura` (paste into libnickel.so.1.0.0.patch):

Spoiler:

<Patch>
patch_name = `Keyboard template - Mini/Touch/Glo/Aura`
patch_enable = `no`
# patch_group = `Keyboard alternatives`
#
## Replaces keys on the Extended Latin keypad with alternatives.
##
## Note that after the device boots, the keypad might just show blank squares
## until after the first book has been opened.
##
## Also note that long-pressing keys on the base keypad will no longer show
## the appropriate list of Extended Latin keys.
#
# Enable uppercase for `ß` (sharp s) key
replace_bytes = 708434, 00 26, 01 26
# Enable uppercase for `ƒ` (script f) key
replace_bytes = 708414, 80 F0 01 00, 01 20 01 20
# Replace layout sign
find_base_address = `ÉÀÇ`
replace_string = 0000, `ÉÀÇ`, `ÉÀÇ`
# Change keyboard layout
find_base_address = `ý\0ÿ\0š\0ž\0`
# Top row, left to right (10 keys):
replace_string = 000C, `æ`, `æ`
replace_string = 000F, `œ`, `œ`
replace_string = 0012, `þ`, `þ`
replace_string = 0006, `š`, `š`
replace_string = 0009, `ž`, `ž`
replace_string = 0018, `ŀ`, `ŀ`
replace_string = FFFFFF8C, `ƒ`, `ƒ`
replace_string = 001B, `μ`, `μ`
replace_string = 001E, `ª`, `ª`
replace_string = 0021, `º`, `º`
# Second row, left to right (11 keys):
replace_string = 0024, `à`, `à`
replace_string = 0036, `è`, `è`
replace_string = 0042, `ì`, `ì`
replace_string = 0045, `ò`, `ò`
replace_string = 0048, `ù`, `ù`
replace_string = 0027, `á`, `á`
replace_string = 0039, `é`, `é`
replace_string = 004B, `í`, `í`
replace_string = 004E, `ó`, `ó`
replace_string = 0051, `ú`, `ú`
replace_string = 0000, `ý`, `ý`
# Third row, left to right (11 keys):
replace_string = 002A, `â`, `â`
replace_string = 003C, `ê`, `ê`
replace_string = 0060, `î`, `î`
replace_string = 0054, `ô`, `ô`
replace_string = 0066, `û`, `û`
replace_string = 002D, `ä`, `ä`
replace_string = 003F, `ë`, `ë`
replace_string = 0063, `ï`, `ï`
replace_string = 0057, `ö`, `ö`
replace_string = 0069, `ü`, `ü`
replace_string = 0003, `ÿ`, `ÿ`
# Fourth row, left to right (10 keys):
replace_string = 0030, `ã`, `ã`
replace_string = 006C, `ñ`, `ñ`
replace_string = 005A, `õ`, `õ`
replace_string = 0033, `å`, `å`
replace_string = FFFFFF89, `ß`, `ß`
replace_string = 006F, `ç`, `ç`
replace_string = 0072, `đ`, `đ`
replace_string = 005D, `ø`, `ø`
replace_string = 0015, `ij`, `ij`
replace_string = 0075, `ł`, `ł`
</Patch>

Layout for AuraHD/GloHD/H2O (Top row cannot be changed.)

1 2 3 4 5 6 7 8 9 0
æ à è ì ò ù á é í ó ú ý
œ â ê î ô û ä ë ï ö ü ÿ
    ã ñ õ å ß ç đ ø ij ł

`Keyboard template - AuraHD/GloHD/H2O` (paste into libnickel.so.1.0.0.patch):

Spoiler:

<Patch>
patch_name = `Keyboard template - AuraHD/GloHD/H2O`
patch_enable = `no`
# patch_group = `Keyboard alternatives`
#
## Replaces keys on the Extended Latin keypad with alternatives.
##
## Note that after the device boots, the keypad might just show blank squares
## until after the first book has been opened.
##
## Also note that long-pressing keys on the base keypad will no longer show
## the appropriate list of Extended Latin keys.
#
# Enable uppercase for `ß` (sharp s) key
replace_bytes = 708434, 00 26, 01 26
# Replace layout sign
find_base_address = `ÉÀÇ`
replace_string = 0000, `ÉÀÇ`, `ÉÀÇ`
# Change keyboard layout
find_base_address = `ý\0ÿ\0š\0ž\0`
# (Top row cannot be changed.)
# Second row, left to right (12 keys):
replace_string = 000C, `æ`, `æ`
replace_string = 0024, `à`, `à`
replace_string = 0036, `è`, `è`
replace_string = 0042, `ì`, `ì`
replace_string = 0045, `ò`, `ò`
replace_string = 0048, `ù`, `ù`
replace_string = 0027, `á`, `á`
replace_string = 0039, `é`, `é`
replace_string = 004B, `í`, `í`
replace_string = 004E, `ó`, `ó`
replace_string = 0051, `ú`, `ú`
replace_string = 0000, `ý`, `ý`
# Third row, left to right (12 keys):
replace_string = 000F, `œ`, `œ`
replace_string = 002A, `â`, `â`
replace_string = 003C, `ê`, `ê`
replace_string = 0060, `î`, `î`
replace_string = 0054, `ô`, `ô`
replace_string = 0066, `û`, `û`
replace_string = 002D, `ä`, `ä`
replace_string = 003F, `ë`, `ë`
replace_string = 0063, `ï`, `ï`
replace_string = 0057, `ö`, `ö`
replace_string = 0069, `ü`, `ü`
replace_string = 0003, `ÿ`, `ÿ`
# Fourth row, left to right (10 keys):
replace_string = 0030, `ã`, `ã`
replace_string = 006C, `ñ`, `ñ`
replace_string = 005A, `õ`, `õ`
replace_string = 0033, `å`, `å`
replace_string = FFFFFF89, `ß`, `ß`
replace_string = 006F, `ç`, `ç`
replace_string = 0072, `đ`, `đ`
replace_string = 005D, `ø`, `ø`
replace_string = 0015, `ij`, `ij`
replace_string = 0075, `ł`, `ł`
</Patch>

Layout for AuraOne:

ý ÿ š ž æ œ þ ß ij ŀ
à á â ä ã å è é ê ë
ò ó ô ö õ ø ì í î ï
  ù ú û ü ñ ç đ ł

`Keyboard template - AuraOne` (paste into libnickel.so.1.0.0.patch):

Spoiler:

<Patch>
patch_name = `Keyboard template - AuraOne`
patch_enable = `no`
# patch_group = `Keyboard alternatives`
#
## Replaces keys on the Extended Latin keypad with alternatives.
##
## Note that after the device boots, the keypad might just show blank squares
## until after the first book has been opened.
##
## Also note that long-pressing keys on the base keypad will no longer show
## the appropriate list of Extended Latin keys.
#
# Enable uppercase for `ß` (sharp s) key
replace_bytes = 708434, 00 26, 01 26
# Replace layout sign
find_base_address = `ÉÀÇ`
replace_string = 0000, `ÉÀÇ`, `ÉÀÇ`
# Change keyboard layout
find_base_address = `ý\0ÿ\0š\0ž\0`
# Top row, left to right (10 keys):
replace_string = 0000, `ý`, `ý`
replace_string = 0003, `ÿ`, `ÿ`
replace_string = 0006, `š`, `š`
replace_string = 0009, `ž`, `ž`
replace_string = 000C, `æ`, `æ`
replace_string = 000F, `œ`, `œ`
replace_string = 0012, `þ`, `þ`
replace_string = FFFFFF89, `ß`, `ß`
replace_string = 0015, `ij`, `ij`
replace_string = 0018, `ŀ`, `ŀ`
# Second row, left to right (10 keys):
replace_string = 0024, `à`, `à`
replace_string = 0027, `á`, `á`
replace_string = 002A, `â`, `â`
replace_string = 002D, `ä`, `ä`
replace_string = 0030, `ã`, `ã`
replace_string = 0033, `å`, `å`
replace_string = 0036, `è`, `è`
replace_string = 0039, `é`, `é`
replace_string = 003C, `ê`, `ê`
replace_string = 003F, `ë`, `ë`
# Third row, left to right (10 keys):
replace_string = 0045, `ò`, `ò`
replace_string = 004E, `ó`, `ó`
replace_string = 0054, `ô`, `ô`
replace_string = 0057, `ö`, `ö`
replace_string = 005A, `õ`, `õ`
replace_string = 005D, `ø`, `ø`
replace_string = 0042, `ì`, `ì`
replace_string = 004B, `í`, `í`
replace_string = 0060, `î`, `î`
replace_string = 0063, `ï`, `ï`
# Fourth row, left to right (8 keys):
replace_string = 0048, `ù`, `ù`
replace_string = 0051, `ú`, `ú`
replace_string = 0066, `û`, `û`
replace_string = 0069, `ü`, `ü`
replace_string = 006C, `ñ`, `ñ`
replace_string = 006F, `ç`, `ç`
replace_string = 0072, `đ`, `đ`
replace_string = 0075, `ł`, `ł`
</Patch>