Single Status Update
If Vegeta picks up Ultra Instinct as well, I could see a Fusion Dance between him and Goku, rather than Potara. Putting on the earrings is a non-martial arts maneuver that requires a conscious decision to go through with it. Fusion Dance is itself a technique, and one that the at-the-time unconscious Goku and Vegeta can't have their pride interfere with. The bodies are thinking on their own, and they're thinking fusing is the way to go.