I was saying earlier that it's kinda inevitable that there will have to be an amendment to the EqA at some point.
I think this is the appropriate thing to campaign for, certainly much more honest than refusing to obey the existing law or claiming it's unclear.
What exactly would you campaign for? Some men want to use the Ladies loos, come what may. In the past those proposing to "Change sex" i.e. have surgery, had to "live as women" for two years. Which seemed to mean putting on a dress and slapping a load of make up on and then use women's loos. Are you going to campaign for those to get a free pass? Are you going to bother to ask the women? How are you going to exclude the voyeurs and perverts, who have no intention of having surgery?
Unless you can identify which men belong into which category, the only safe rule is to keep all men out. And until about 30 years ago, that was pretty much the accepted rule and "Gender" outside the world of languages and grammar was nonsense.