Make sure to check the Nucleus Coop App if you haven’t already!
https://nucleus-coop.github.io/
It turns games that don’t have a native local coop mode into local coop by simulating a LAN and running two instances of the game communicating exclusively with each other. It works really well, especially if you have a multi-monitor setup.
I have played multiple games in local coop with my brother with this, including Elden Ring. It’s been a blast.
Self-curation through obfuscation