The more of these we can do, the better, and I think that multiple simultaneous projects have a better chance for success. Contributions to professional service, of course, cut into one's research time, so it would be nice if any efforts could be well-funded and appropriately recognized.
I think that in the past there have been efforts to attract women to graduate school and to help them stay there (for example in my graduate school while I was there). These efforts tend to get more attention than the strategy of focusing on undergraduates, and I think it's partly because there are a small number of graduate schools, so it seems like a more manageable agenda.
But I'm particularly a fan of the strategy of recruiting more undergraduate majors. This strategy combines two of my commitments: to increasing gender equity in education and to promoting philosophy.
Leaving reality for the realm of fantasy, I've concocted a (fantastic!) plan, with the goal of making the project of recruiting to the major seem more manageable:
There are almost 750 universities in the US that offer a bachelor's degree in philosophy. Since there are about 6500 degrees awarded every year, that comes to an average of 9 students per institution. (Many with zero and some with huge numbers--this is fantasy, remember?)
If you teach at one of those institutions, then ask yourself: Could I attract just one additional woman to major in philosophy?
If most universities attracted just one more woman to the philosophy major, the number of degrees earned in philosophy would increase by over 10% and the percentage of philosophy majors who are women would increase from 30% to 37%.