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i don’t know, sorry.
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sadly, yes. the custom rom scene is really dead these days. there are some smaller roms like evolution x, paranoid android, blissos, derpfest (probably a few more) but i’m not sure if using them is a very good idea. honestly haven’t seen much useful feature from those since android 9 days… i just use lineageos btw, but usually an older version (<=android 11 so i can use gravitybox, which gives those customization features)
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if you can bootloader unlock them, it is possible to install a treble GSI rom, since all android devices released with android 8 oreo and later features treble. try searching phh-treble, these roms are built to work on as many devices as possible and some features may not work properly.
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sorry, i have no idea about this. maybe you can lock the phone down to the bare minimum by hiding/disabling all the apps except the essential stuff? lineageos stock is pretty much already that, just need to remove the web browser with adb pm uninstall i believe.




yeah i occasionally do this with epubs from shadow libraries. it’s not foss but i use Lithium (com.faultexception.reader) for it. only works for epub, but it’s very lightweight/fast and not privacy invading. there’s a pro version but the free one seems to work fine, and i couldn’t find any cracked versions. having my volup btn for next page is very useful for one hand reading in mass transit.