If you haven’t updated your kindle to 5.18.1, you can also jailbreak it and install koreader which allows you to read epub natively on the kindle, see https://kindlemodding.org/jailbreaking/WinterBreak/

I don’t think that’s exactly true. Only InkPad X Pro, InkPad EO and Color Note are on Android, but I think all other readers are Linux (non-android). On the other hand, some services only work with iOS or android (for example the Finnish e-library) so this may also be good to keep in mind (I had no idea pocketbook even have android versions until now).

Ok, so what are the other options? The entry level Mac mini has three Thunderbolt plus two other usb-c ports and some other stuff. I fail to see how phones are relevant.

The holy horse of Imam Husayn

I will keep that in mind!

I have no experience of actual HdHomerun devices, but I tried emulating HDHomerun with tvheadend and antennas when I was setting up. I didn’t get that to work with Plex, so I’m not sure that would work with jellyfin either. It wouldn’t make sense to buy new equipment since Plex works fine with what I already own (and I generally avoid buying USA products)

I’m running Plex with the Xbox One Digital TV Tuner for live TV channels. Would that work with Jellyfin now? When I set this system up, Plex was the only thing that I got to work.