+1 for Libby. Also shout out to Z-Library, Library Genesis, and the Internet Archive for all the book epubs and pdfs you can find there

I’m using it currently on a Pixel 7 Pro on GrapheneOS on Android 15 with no issues if that helps

If you’re looking for a reasonable FOSS swipe keyboard, try AnySoftKeyboard. While still a step below the non FOSS keyboards I’ve used before like Swiftkey, it gets the job done reasonably well

What about an Android tablet running a custom ROM without GApps flashed, and an adapter for HDMI? There’s a handful of widely sold tablets that also have a decent development scene and are cheap second hand. Check XDA forums for various models before deciding which one to get