I bought an external Hayes 56k modem and suddenly Windows was a memory. Happy days.

For you, certainly look at Kobo.

PocketBook do some nice readers, Linux-based. “drag and drop” books in, Koreader works on it (reading app).

Low-fuss.

But look at Kobo first (and I’m a PocketBook owner!)

https://handynewsreader.blogspot.com/?m=1

This looks interesting. It has volume button and tap zone navigation. Opml exports from Feeder have gone in okay too.