So it’s probably not a big issue. I’d like input from non-binary speakers of those languages though; since I’m not non-binary myself it’s possible that my view is incorrect.
I’m only a native Romance language speaker (Spanish) who is both an ally and an amateur wordsmith.
Due to this, I’ll not pretend to go into any depth of why you’re wrong per the zeitgeist of Spanish youth today, but will instead give you the more or less settled informal solution (The RAE isn’t likely to add it officially):