There are some modders experimenting with eGPUs on the Deck, but it’s really impractical. The Deck USB-C connector isn’t powerful enough to handle an external GPU and the OS doesn’t support it.
Valve would need to release new hardware for it to be feasible.
Careful! Last time I sarcastically posted a stupid AI idea, within minutes a bunch of venture capitalists tracked me down, broke down my door and threw money at me non stop for hours.