I would not mind seeing a rather dashing, smooth Master/Missy with a foil for fencing once again.
P.S. Agreed on the Master in Spyfall. The Master's always been the best schemer around, but to add the spy lens to it was a rather inspired take. But then again, that does mean a slower, more calculated, more deliberate Master.
I really enjoy Dhawan in the role, but it doesn't mean the role can't change in personality. After all, almost every incarnation of the Doctor didn't really get their unique personality cemented until a few episodes in. I'd be happy to chalk up his performance in TTC as just some sort of growing pain; even Simm's Master is different in some ways between the 10th and 12th Doctors.