Jellyfin is just so much better, imo. Much cleaner, less stuff that I don’t actually need.
I'm a plex pass lifetime owner, but I don’t regret switching to Jellyfin one bit.
I have done that in the past, using a raspberry pi. I was using Plex (Rasplex) back then. The main problem was convenience, mostly with the possibility to have proper remote control from the couch.
For just myself, this could possibly work, but it’s a non-starter for the non technical people in my house. They need a remote control on the couch and the ability to easily open different streaming apps with that.
You can make changes using Organic Maps. It’s also a very good app in general imo. It’s open source, gives you OSM maps offline and has decent navigation. I have switched to it almost fully (from Google and Apple Maps) a while ago already.
As others have already mentioned, try qwen2.5-cider. With 16 GB, you should be able to confortably fit a quantised version of the 14b variant into VRAM. You can also try the 32b variant, but it will be much slower because not all layers can be off-loaded to the GPU.