Ah ok, now I understand. I don't have a steam deck at hand but based on a quick google search I think it should be possible. The key is whether you are able to connect the steamdecks to the PC so that the Javascript Gamepad API recognizes the decks as controllers. You can connect the decks to the PC and if they show up on this site: https://hardwaretester.com/gamepad they should work with Gaming Couch!