You've left out the most obvious option - which is option 4: third spaces and gender neutral facilities for those that prefer them, alongside single sex ( biological sex)spaces for those that need, require or prefer them.
I don't think this is obvious because 1) building a fourth set of toilets (male, female, disabled, unisex) is necessarily feasible everywhere, and 2) what if trans men and trans women don't want to share a unisex toilet?
You seem focused on protecting transwomen from men, but are happy to impose males into women's spaces without any thought or concern for their feelings of comfort, dignity or safety.
That's an incorrect interpretation, I have repeatedly stressed the negative impact this will have on cis women. I don't think any attempt to express concern for trans women will be supported here, so I didn't focus on that.
Your arguments are no substitutes for what Spooky was able to offer. You have even admitteed you are not willing to get into a good faith discussion on the nature of sex and gender.
I do not believe that getting sidetracked by debating what is a woman or what is sex or what is gender will help provide good faith responses to this topic. It's a distraction from what is important, which is making sure that people are supported and safe.
@Deiji, could you explain how you reconcile the above with the universal, human-rights-driven standard of sex-segregated facilities in certain contexts?
Trans people are segregated in some limited contexts, as the law allows. I do not believe that judging people by how they look relates to human rights.
On this basis how do you exclude cis men?
It works the same no matter what you do. Whether you ask trans women or trans men to use women's toilets, either way you have the risk of cis men entering. The idea that asking trans women to use men's facilities will stop cis men from entering women's facilities is a logical fallacy; it will make it easier for cis men to enter women's facilities.