https://stallman.org/articles/genderless-pronouns.html
is interesting.

I once went searching for more natural-sounding singular pronouns than “xe” or “ze”, but couldn’t find any that had any significant following. (Singular “they” is ok in some places, but often sounds unnatural, and introduces more ambiguity in a language that’s already ambiguous and difficult enough to learn for newcomers.)

Stallman’s suggestion of “perse” (from person) for “he/she”, “per” for “her/him”, and “pers” for “hers/his” is easily to learn, sounds natural pretty quickly, and doesn’t sacrifice clarity. “perse” and “pers” sounding alike in speech might be an issue, but maybe the context will clarify it in most cases, and maybe it’s less of an ambiguity than arises from singular “they”? What do you think?