make them unusable for female members of some strict religious groups?
Transwomen are already in women's toilets, are religious women not using them now.
but now that guy in drag would hopefully be challenged
So if a guy in drag entered a woman's toilet and exposed himself in the communal area he would be challenged right. If self id comes in he will still be committing an offence by exposing hinself so can still be challenged.
I'm also against self id but the toilet thing is not the issue. A quite toilet such as an empty train station is dangerous now, anyone can enter. A busy toilet such as a shopping centre your safe regardless because there is cctv on the door, security guards and lots of people coming and going. Toilets also have locked cubical and trans woman up to no good outside the cubical will still be committing an offence and will get in trouble.
Changing rooms are different because we have a communal area. How do you challenge what's just getting changed and what's flashing your penis for sexual gratification. But think about it logically, there's nothing they can do in a toilet that they can't already do and the repercussions remain the same.
Plus this thread isn't actually talking about self id but suggesting no trans people should be in a women's toilet they should have a third space. I'm saying a third space is unnecessary as the system we have now works fine. You are a woman or look pretty much like a woman you use the women's. You look like a bloke regardless of what you are wearing (jess Bradley) you use the mens.