I think one would be to require universities to report the diversity of the main faculty. Often universities haven't even thought about that. When you ask for a list of the female science faculty, the dean of science writes, “Oh, gee, I didn't realize I had so few.”
They're not aware because they do not have to report that data. I think that would be a major step.
Then, as I mentioned earlier, the studies that oversee and provide accreditation to programs could be mandated to look at diversity of faculty within universities. It could be pointed out to universities that they're not meeting the bar.