blue the reason you appear to oppose self ID is so you can ring fence your own access.
That doesn't work for women. There is no earthly way you can contain this to people with a GRC.
Safeguarding of women and children is undermined by the fact that they cannot maintain sex segregated boundaries. Loopholes are obviously a complete contradiction.
Furthermore, you can't guarantee who has a GRC, you can't guarantee that people with a GRC are harmless (some are not), but the major thing you can't guarantee is that the women in those spaces wouldn't be triggered by the presence of a male, irrespective of his paperwork.
Whether this worked ten years ago when there were only a handful, or not, is now irrelevant. It's too late. And many women have said it didn't work. They had to put up or shut up. It certainly would not have worked for many women on an individual, yet completely unheard basis.
It was a bad law, that was resisted by many MPs at the time, and the only reason it passed was because of the numbers and the homophobic attitudes to gay marriage. And it was felt that the damage to women was acceptable.
It isn't.
Many women aren't doing this for themselves, individually. They're fighting for a collective of women, many of whom will have been assaulted and raped, they are fighting for children, they are fighting for sports women, and they are fighting for vulnerable prison inmates.
I'm not sure you realise, but every transwoman has a reason why it is they who should be the exception. In your case it's all the reasons why you are transsexual. For others it's for how long they have transitioned. For yet more it's if they pass.
And others are more upfront about their negative reasons.
The lack of symmetry is startling. Self-serving interest on the one hand, and altruism on the other.