It might be possible, but it won’t be good. There isn’t a great low latency way to stream video on Linux outside of Steam Remote Play, which would require another PC. You’d be better off grabbing a dock off Amazon and using a cable. You can use FSR to upscale your game to 1080p too.
At the moment, Steam Workshop mods are easy as pie but Nexus mods are hit or miss. However there is a new Nexus mod installer being worked on that will supposedly run on Linux (and by extension SteamOS) so that may make Nexus mids much easier to install.