Also, in terms of Wong's portrayal, I think he can still work for Doctor Strange without being his "Yes Master" manservant. It seems I'm constantly referring to JONATHAN STRANGE & MR NORRELL as a benchmark for how this film could be realised, but I could see Wong being portrayed as being like the Childemass to Strange's Mr. Norrell. Someone who is Strange's "servant," yes, but someone who also has his own agency and opinions and commands respect in his own right, and who acts as more of a friend and confidante (and henchman!) to Strange than just a dogsbody.