Degendering is becoming a thing now?
Under the Forstater finding I think that one's dead in the water.
I am willing to engage in a mutually respectful social contract with someone by avoiding using a pronoun they have told me they do not wish or agree with - which means making an effort for them and jumping my language through a lot of hoops. Already quite a rude demand, all in all. I will not however lie and use a word I do not believe or agree with for them. I will expect the reciprocal respect of accepting using their name instead.
If they wish to push me on this, they're going to find me driven to discourtesy and they may wish they hadn't, because I will not be enacting a belief I do not hold. Social contracts are two way and respect is a reciprocal thing.