We need to embrace that all decisions we make are emotional, even the rational ones , and create a process that facilitates the desired change. I believe this can be done by hiring competent minorities into teams , where although they are a minority in general they will not be on their team. These teams should not only be that minority as you in a truly inclusive system can't define people by a trait.
Since its a minority you probably have to do some extra legway in facilitating matching these teams well to problems the the team members find interesting and that there are growth opportunities. However, that is an ongoing conversation you should be having at any rate.
By these teams being competent they will through normal work-conversations and collaborations open minds on how successful people look like. Very suddenly it will be clear that both nerdy and pretty girls as well as anyone in between can code well, and that people that talk and walk in ways that make you uncomfortable might actually be competent and give you a unique perspective if you truly include them in your conversation.
Yes, it is not flashy and won't make great campaign posters. However, it empowers individuals while helping those individuals deal with being a minority without it being a zero sum game. And then we can watch history unfold, like how asians went from being railroad grunt work to model immigrants.
 suggested action by feminists and researchers like Francis Frei, although I am not sure they support this full proposal