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Re:Kobo unveils Sideload Mode to their e-readers by 3np on Saturday January 22, 2022 @11:12AM (#30037889)
Probably not what you have in mind (yet) but on the other end of that spectrum you find the PineNote. I've seen people run a Linux DE on this.

https://www.pine64.org/pinenote/

Re:Kobo unveils Sideload Mode to their e-readers by capableweb on Saturday January 22, 2022 @11:50AM (#30038285)
Cool device that would be nice if the goal is hacking on something, but for a reading experience, PineNote is probably not what you're looking for (today at least).