I don’t know if it’s that much of a minor change. The code around gender seems to be rather interesting - the dwarf is explicitly of “undefined” gender, and iirc that defaults to female in a couple of weird places. And how do you handle explicitly gendered cutscenes? Leah and Alex have heart events that are contingent on the farmer’s gender (and - spoilers - George gets over his homophobia if you marry Alex as a male farmer - how would George respond to a non binary farmer on spring 1 year 1?)
I think it would be awesome if CA did add a non-binary option, but I think someone who actually is non-binary is going to be able to do way better with with writing authentic interactions. CA is awesome, and I assume he’s a trans ally, but I think this would take an absurd amount of research for him to do well.
That said, I’ll be disappointed if Haunted Chocolatier doesn’t have a non-binary option.