I've worked with a couple companies like that... usually it's corporate driven (someone high up saw it at some other company and wanted to show how progressive their company was too)... then they hired someone whose only job was to promote such ideas and slow down work in other departments.

I live in a country that's 99.9% white in a field with 85%+ men. We don't get non-white people, because there are none here, and we don't get women, because there are very few women in such colleges at the first place. Comparing to other countries nearby and the ratio of women in tech colleges there (and later jobs), the only solution would be, to fuck up the economy so hard, that stem jobs would be one of the few ways to lead a relatively normal life, and then girls (who get better scores in hightschools and standardized exams here) would start studying one of those professions (and then probably leave the country).