Ok, so let’s suppose for a moment that we do perform these linguistic contortions, and accommodate non binary and trans inclusive language when talking about endometriosis. Triggering avoided.
What happens to those non binary and trans identified females who actually do have endo? the specialists who treat endo are gynaes. Gynaes work on gynae wards (if surgery is required), which one would certainly hope are single sex. First line treatment is hormonal. You have to be able to discuss impact on your cycle, your sex life - when do you bleed? When does it hurt? What are your plans for family and how will your illness and treatment affect these?
If people can’t cope with words on a page or a screen, how on earth will they cope with any of this? I’m not saying this to be mean, I am saying this because I just dont think it helps. If you’ve got endo, you’re a woman. You are going to have to deal with that reality. If that’s distressing, then you need help with that distress. Turning the world inside out to accommodate your reality won’t help.