I second that this is a interesting thread for a variety of reasons/posters.
Going by what I see amongst DCs friends and classmates, the trans ideology is not in any way threatening patriarchal norms because it is wholly regressive in terms of how male and female are portrayed for those trans identifying young people ie they absolutely conform to sexist stereotypes. The trans men have short hair, no makeup and buy clothes from the men’s department, whilst the trans girls grow their hair long, wear makeup and dresses.
I can see the OP wants very much to find that elusive ’third way’ Keep the way it works currently (people with a GRC to be treated as birth sex) but support service providers and employers to apply sex based exemptions accurately and effectively but this sentence jumped out at me.
First, the way it currently works is that men with a GRC are treated legally in accordance with their legal sex (woman), which is why service providers and employers are struggling to apply sex-based exemptions. Second, TRAs absolutely do not want to be treated or known or even spoken about as their birth sex, which is why we’re where we are now: toilets, pronouns, sports, schools, women short lists, prisons, police prosecutions, medical language (chest feeding, cervix havers etc), hospitals etc etc.