I’ve been thinking about getting an e-reader (thinking kobo or boox) and wanted to know if it’s possible to remove unwanted stuff (like the play store) using adb? I plan on just downloading .epub files from annas-archive and ao3, so it would be good if firefox or mull can be installed via .apk.
Have a look at the Onyx Boox line of devices.
They run Android under the hood, so various file sync apps just work (i.e. to move books wirelessly from your own Network Attached Storage.)
But beware that the tablet versions default to a much lower screnn refresh rate than a typical ebook, since they don’t need the refresh when you’re taking notes. There’s configuration options to make them act more like an ebook reader, at the cost of some of the battery life.