This is possible using Trakt. Add a movie or series to your watchlist, sonarr & Radarr sync from this list and add to jellyfin.

There’s also a plugin in jellyfin itself for Trakt that can report back to say when you’ve watched it I believe.

If u fancy making it work on x86 with the newer API, that would be great! Looks to be mostly abandoned now.

Chromecast 4k is my choice

Worth noting, it doesn’t appear to play nice with sonarr v4. Had to downgrade my system for it to continue working.

https://github.com/ManiMatter/decluttarr

Think the “Quality Definitions” section of the settings in Radarr is what you’re looking for.

Decent VPNs should be mostly unnoticeable