Bail Organa (Jimmy Smits) was part of the prequels...so what role in the story as it was presented would you change to female?
If these pissweak reasons why they need to be as they are is all you have, then all of them
The Imperials are always white, always human and always male because the Emperor is meant to be a fascist xenophobe who is against progressive values. It's why the leader of the Rebellion is female (Mon Mothma).
Even if you took that as being the reason for the Empire being white guys, why is the Rebellion actually pretty bloody similar? There was not an absent of White Guy Opinions around the big table they all shouted at each other, nor of White Guys among the fighters or pretty much anywhere else.
She told everyone on board the ship she was on what her dad had said on the hologram. They even make a huge point of that fact when K2-SO says "Destroy the reactor and the whole system goes down". That's how you said it: "The whole system goes down."" Cassian Andor says to her 'They were never going to believe you. But I believe you.' That sounds like a vote to me. You think all those soldiers - who disobeyed orders to follow her - did so without acknowledging her as leader?
Not because of her combat expertise, but because they believe she isn't lying about what her father said.