JohnnyWumpa there is a way to spoof the hardware so the game doesn't think you're on a steam deck, someone made a guide here.

niggakilla25
@niggakilla25
Posts
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How to get Plutonium Working on Steam Deck. -
Uninstall campaign and multiplayerIs there a way I can uninstall the multiplayer and campaign files but keep the zombies ones? Additionally, will it create any issues with my game? I am also not using steam.