I think it's time that your Greco-Roman card was revoked:How come it never saw public light and was never mentioned in any of the historical, philosophical or political writings then? Nowadays, just a couple of years ago, this term popped up and all the people go wild about it and try to promote political, philosophical and even (as you do) historical justification for it.
it think this is simply a modern zeitgeist and joke honestly. the only cases i am familar with, of the transsexual people/creatures, is ancient MYTHOLOGY.
https://en.wikipedia.org/wiki/Elagabalus#Sex.2Fgender_controversy
https://en.wikipedia.org/wiki/Galli
https://en.wikipedia.org/wiki/Hijra_(South_Asia)
https://en.wikipedia.org/wiki/Gender_in_Bugis_society
https://en.wikipedia.org/wiki/Muxe
https://en.wikipedia.org/wiki/Balkan_sworn_virgins
Etc., etc.