The place for that sort of discussion would be:
https://www.mobileread.com/forums/fo...play.php?f=216
The members here are too few and not likely to have the time to take on a major project here.
But even talking with the people of the KOreader project about adding in another e-book format is still your best bet.
KOreader does run on these grayscale Kindles (it has its origins here) and supports additional e-reader devices.