Trying this.
Thanks again, NiLuJe.
(P.S. I couldn't find
K:\system/com.amazon.ebook.booklet.reader , might be an idea to change the OP to reference
system\com.amazon.ebook.booklet.reader 
.)
Yup, my scripting abilities extend about as far as proofreading

.
Edit: Working. You can even use normal Notepad to edit the profile - you just need to press enter so that
FONT_FAMILY=alt and
ALLOW_USER_FONT=true are on their own lines in the file.
Amazon's font isn't pretty (to my eyes), but is readable at a tiny size. Don't think I'll go back, though.