As already mentioned, postmarketOS is probably closest to what you want for an open source android replacement, though it’s still not 100% there if you’re looking for a perfect alternative.
Personally I’m going to try it out as a daily driver when I can get a cheap pixel 8 when the 9 comes out later this year
Anecdotal, but for me worked a lot better with my monitors (both the same exact model though). On plasma 5 they had trouble waking up after suspending
I’ll throw my vote in for Jellyfin as well. My wife had a big dvd and Blu-ray collection and it streams perfectly over local network. If you’re into dev at all, I use mine to as a dev environment and Jenkins container to test and deploy my commits
Exactly what I do and works like a dream. Had a VPS and nginx to proxy domain to it but got rid of it because I really had no use for it, the Tailscale method worked so well.