I'd love to see:
in the opposite universes
Batman, I would hope to actually set up shop as a city level vigilantie. Not as 'Bat-God' in the Marvel Universe. Have him trying to learn about the players, who is good/bad. His tech whilst good, is not as technologically advanced as Stark Industries etc. Dealing with guys like Bullseye, Batroc the Hand, Maggia, Mysterio etc.
Would be good to see him unpick the Hand. Have run ins with Shang Chi, Iron Man, Black Cat etc.
Doctor Strange is a natural fit in Vertigo. Have him stunned as the majority of his powers have disapeared (due to contracts with the Vishanti or calling on beings like Cyttorak). He has his own personal spells and must figure out the strange new rules on dimensonal travel. As well as navigating the differences between the realms of Order and Chaos. He would be fantastic on trying to draw on power from being slike Desire, Dream or Delirium.
Also - who wins Batman vs Dr Strange. 1 month worth of prep?
Think Bruce and Tony come to blows, and that they compete for ladies also!
Would like to see Superman and Spiderman switch earths