I literally don't give a **** about whether or not the existing comic image of Stephen Strange looks exactly like his movie portrayal. Well, that's not true, I've already said I think it would be a really good idea for him to not look like Tony, regardless of whether or not he's white.
And I don't think they should be exclusively auditioning black guys, or Asian guys, or <x, y, z>.
Do I think an Asian casting would mitigate some of the disturbing aspects of Strange's backstory? Yes. Do I think it would address the whole problem? No - the whole problem is the narrative on Western imperialism, and Strange will inevitably be from the US and have no history of association with Eastern mysticism.
To be clear, though, I don't think a different racial casting would mean crap if they had a race-blind script. The character of Stephen Strange would need a cultural reason to return to Tibet for the Asian casting to mean anything (most likely scenario being learning of its existence through something to do with his legacy).
Of course, I'm sure that would drive you insane.
Honestly, though, at the end of the day the movies are going to continue to diverge from the comics more and more. That's inevitable. Better to make peace with it.
In all likelihood, Stephen Strange is gonna be a white guy with no connection to Asia who masters ancient Eastern mysticism in a few years, problematic implications intact, and you can die happy.