If a man is really convinced he passes so badly that he will 'out' himself by entering a mixed sex gender neutral space and look entirely different to any woman choosing to use a mixed sex space then how was using the women's single sex space any different in experience? Other than the lack of experience of non consenting women and power over them, and the existence of a woman's resource he couldn't own and commandeer/a form of womanhood unconquered by him?
Which would be a 'him' problem.
It is surely up to all the women who declare they love taking their clothes off with men and peeing/showering with them, and all the men who have so gleefully told women it's fine, to rush into the mixed sex spaces shouting love, glitter, support and mixed sex heaven. And surely then men with TQ identities can do the same. The point is, that there are facilities for all, access for all, and consent all round.
If that's going to be untangled in court it will come down to plain talk about misogyny, views that are distinctly male supremacist and about lack of value or respect for women and their equality or right to refuse to be a male resource, the right of women not to be involved in men's personal experiences including sexual ones, AGP is going to be discussed in very great depth, and the plain fact that men are not women regardless of what pieces of paper they are own and what meds/surgery have been used, and that women have rights too .
It won't be a pleasant conversation. It won't be able to be a sensitive one. It's going to make Naomi and Ben's work in court this far look sweet and mild by comparison.