Exactly!Sod a third option for toilets, just pee according to your sex and not your fancy dress. Job done.
Stuff your "gender" - these things are segregated according to body type ie SEX.
And after all, according to TW, they aren't in the toilets to intimidate anyone - they only go to perform their bodily functions. No-one will be looking at them, they will be looking at no-one else, and we women can get on with having a wee, stapling a snapped bra strap and dealing with menstrual problems.
And if there is any male violence against them, then like real women through the ages, they can learn how to deal with bullying blokes.