I don't share your view regarding those who have completed a medical transition. I can share with such a person.
That's lucky for you. What shall we do with the women who can't? And who need equality of access to facilities and resources too, and had it when women's spaces and facilities focused on being inclusive to all women, instead of just the women privileged enough to choose to share them with men? Those women are tax payers, who pay for these facilities too. Their access to society and their inclusion is no less important than a man's.
I cannot share with a man who self IDs.
But realistically, how are you going to tell the difference? You can't ask. You have no way of knowing. To what extent 'completed'? How are you going to tell? How are you going to say no to the ones you don't agree with?
The GRA was this compromise attempt: it was intended for a very, very small number of men who were either fully transitioned or in the process of. Women were not considered. Men decided that such a small number of such transitioned men was something women could suck up without much harm. Thanks men for deciding for us and with no skin in the game.
This has led to any bloke at any time walking into a women's space regardless of the women there, and being able to get threatening and angry if any of them dare say anything or even in some cases known, to try and leave the room. The bloke taking selfies with the sword in the women's toilets for example. Men have proved; they lack the capacity as a sex class to respect or care enough about women, or to see women as something other than a resource they are wholly entitled to, for this to work and men have pushed this to the point we are now at. Where people have been truly stupid enough to permit convicted serious sex criminals to rape women prisoners and to permit men to rape women on hospital wards.
If it's one man, it's all of them. This has been proven.
The answer is mixed sex facilities where women who are happy to get their kit off in front of male strangers can do so, choosing their own consent and conditions, and male people can have the company of women that they so desire. And the women who do not and cannot consent to this can have their own single sex facilities.
It is however going to require law and gatekeeping, since very sadly, men have proved nothing but legal consequences will make them respect women's rights, consent and needs.