I don't think the proposed pronoun works. Seeing "Hu did it" in print makes me think that it's either a Welsh or Chinese person, or that the author has spelled "Who" wrong. Although it can be awkward, "They" seems a much better choice. Personally, I'd probably continue with a mixture of "they" and, where it sounds bad (although I can't think of any examples) an occasional generic "him", but others would probably want "they" throughout. Fair enough.
It does raise (at least for me!) the broader issue of mangling the language for the sake of ... hmm... even this is tricky. Is there a neutral form of "political correctness"? Perhaps the rather clumsy "social inclusivity", which sounds like a department of the local council. Anyhow, I wince somewhat whenever I see jargon like "racefail" - partly because it looks like Newspeak and is ugly, but also because it has the effect of excluding well-meaning people from the discussion who don't know the terms of the moment (and they do quite often change).