Hi Paul,
English has a singular "they". It doesn't suggest androgyny, either, from the definitions I've seen. For instance, Oxford English Dictionary:
2. In anaphoric reference to a singular noun or pronoun of undetermined gender: he or she.
The first usage example OED provides is from 1375. I don't think replacing "he" with "she" addresses the problem, it's still assuming a default gender. It's not too much tricker to search code for he/him & replace with they/them but that's also just an implementation issue, not a policy one.
It sounds like people are otherwise supportive but I'm not sure what the next step should be.