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My partner has a Box that runs android, complete with apk side loading its basically an android tablet! Super cool so far - there’s even a model with a color screen!
I slapped the Nextcloud app on there and she has been syncing her books between her phone and the boox!
Recommend checking them out! Sorry, typo’d on my comment - the brand name is Boox!
I have hers all loaded up with a FOSS reader, f-droid (droid-ify), Nextcloud, Element messenger… The only thing I haven’t put time into is custom launcher stuff - but the native launcher isn’t half bad, if you ignore their attempts to coax you into their cloud subscription crap!