Great article!

You missed out on my favorite alternative - Spivak pronouns - e, em, eir, eirs, emself.

https://en.wikipedia.org/wiki/Spivak_pronoun

The nice thing about them is that I use them in speech all the time, and no one ever notices, because they sound so like the existing pronouns. "E emself didn't want to do it, but eir husband made them."