Added this as non-steam game. Works fine, nothing to tinker.

Expert steps - if you want to make sure you can load your saves regardless if you choose to launch by Steam, Lutris or Heroic (ie, you're playing the same saves on all platforms) then you need to symlink the pfx directory to the one where you store your gamesaves. Since I installed thru Heroic, I symlinked the Lutris and Steam pfx folders back to the Heroic one.