All you actually need are sonarr (tv) radarr (movies) overseer (request management) and prowlarr (indexer management) you don't actually need the last two.
I use proxmox has the base OS to deploy different virtual machines/LXCs depending on what I need. I have a dedicated docker lxc among those. Say what you will about docker, and man do people have opinions, but proxmox is probably the best way to run a multi lxc/VM setup. Highly recommend regardless of what else you do.
Just run the installer with proton? You can do it by adding it to steam, adding compatibility in the settings then running it. Then do the same compatibility for the game exe.
Also acting like this is a linux problem makes you a moron
I don't use Nix but from what I'm reading, this seems like a dramatic overreaction.