Actually the problem is not that hard to solve unless you are trying to be deliberately obnoxious:
You say “no binario\a” depending to the noun it defines. It’s correct to say no binaria because it refers to a person (in spanish persona, female noun).
But it’s also ok to say no binario if you refer to a human being (ser humano in spanish, this one male noun).
Actually the problem is not that hard to solve unless you are trying to be deliberately obnoxious:
You say “no binario\a” depending to the noun it defines. It’s correct to say no binaria because it refers to a person (in spanish persona, female noun).
But it’s also ok to say no binario if you refer to a human being (ser humano in spanish, this one male noun).
why do this instead of “no binarie”? according to others this is what actual spanish non-binary people do
Yes but if you’re not deliberately obnoxious how can you possibly signal to the world just how virtuous you are?