The requirement for x86_64 eliminates most XP era machines, though I was certainly running XP well into the Vista era on potentially compatible hardware.

How old are you thinking?

Assuming Samsung didn’t remove it, Android has this built in. Search ‘rules’ in settings.

I have a Kobo Clara 2E. It’s fine. I wish it was smaller but no one sells a small e-reader anymore. Kinda miss the form factor of my old first gen Kindle Oasis.