As a quick reference, Heidi Hartmann in the United States has been involved in some very large-scale studies that have compared on the one hand an overhaul of an entire public sector workforce—for example, a whole state in the United States—and on the other, both the costs and the benefits and the types of outcomes for more targeted pay equity, gender discrimination-focused programs.
Not surprisingly, the conclusion that was reached was that the whole workforce do-overs are much more expensive and tend to minimize the benefits, for the gender-based discrimination, and at the other extreme the programs that were more directly focused at gender-based discrimination result in overall fewer costs but much greater impact upon the specific problem of gender discrimination.
I think this is something worth taking into consideration. I can provide references to some of her studies, if you want to look at some of the details that enter into this finding.