Really, given the premise that this is an alternate timeline that diverged from the original, they're limited by the character casting of
the original, which was heavy on the white males by dint of being a 1960s TV show. They'd be freer to add diversity if it had simply been a wholesale reboot, Galactica
-style. Then they could have, say, a black McCoy, a female Sulu, whatever. (Khan Noonien Kaur
We still have Stella Mudd.