I'd definitely go for Kulich over Thompson for Akaar. Kulich has the physical presence, the imposing sense that he could kick your ass if he wanted to. Thompson has this very soft, very old moneyed elite vibe. He's the sort of man you hire to play a rich old plutocrat or desk jockey. Obviously, Akaar is
a bit of a desk jockey as Starfleet C-in-C, but he started off as a field officer, and he's still supposed to come across that way, I think.