Are you Swedish? Just wondering because I've never seen the gender neutral pronoun "hen" in English.
I realize that English speakers use "you" for both singular and plural, having retired "thee" and "thou", but the resulting ambiguity has led to the creation of a new word, "y'all", or sometimes prepending it with "all of" for clarity.
Using "they/them" in the singular will just lead us down the same path.
Why not short circuit it and just add the pronoun English speakers have needed forever?
How often is the gender of the pronouned person(s) relevant? In my experience, almost never.
That's why I settled on borrowing a word that has proven its mettle
(Edit: I used "he" here because William Gibson seemed to identify as a guy, but Gibson's gender is completely irrelevant to this.)