Mods here may not appreciate this post since it’s pretty off topic, but I’m sure glad to have seen this!

Syncthing solves this problem for me without my keyring being exposed to any outside servers.

You can also use Redreader. It’s been my main way of accessing reddit for years and it’s actually the only app (that I know of) with the API exception for being accessibility focused and non-monetized. It’s FOSS and has been ad free forever, although I fear reddit will make them start serving reddit’s ads on the first.