I think women’s leagues have their place still. Or some kind of system to encourage more women into chess. There’s currently 15.7k men with titles and only 4k women with titles. Until those numbers get closer I would want to see some kind of action taken.
If you want to get radical with women’s league you can just have the requirement for them to declare that you are a woman. It can quite literally be a checkbox on a forum when registering. Social pressure will take care of most of the issues. The edge case of men regesterioin bad faith can be handled on a case by case basis.