kindle 4 huh...
I seem to recall Geekmaster had developed a solution that moved the whole thing up or down a bit... for the Kindle 3... perhaps that could be adapted.
EDIT: Here...
https://www.mobileread.com/forums/sho...d.php?t=158589
and the fixed up build of it by me here...
https://www.mobileread.com/forums/sho...8&postcount=13
Would need adapting I guess. that in your skills range?