Not that I didn't enjoy the Doctor Strange movie...but there was another direction that they could have gone:
See, in this particular universe, Tony Stark and Stephen Strange met on the New York party circuit before their respective origins...
So in this timeline, Stark's guilt is the driving force of their search for a cure...
Plus his computer automatically aligns his hands and stance for optimum spell-casting!!
And when it comes time to fight Dormammu, well, it's time to go full armor:
That is, until Strange betrays Stark!! He got tired of Tony postponing a search for the cure for his hands to save the universe and stuff, and Dormammu promised to restore his hands:
From What If? #113 (1998)