Ah yes, that's right, by miniseries I mean TV show, and by historically entrenched, I mean from the book fandom spilling into TV. I am thinking of the TV show as a separate branch of an overarching Good Omens fandom. So just the book and the show, no more branches. It's like a Y.

TV canon has a different layer for more than just the visual language--there are sequences fleshed out that are new or "missing scene" type affairs. I would say this is an interpretation with deliberate inclusion of queer and POC, so if someone is reading Crowley as genderqueer, that would be both in intent and execution. Considering that, I can't in good conscious oppose his inclusion. Unlike in Aziraphale's case (as far as I know :b), the substance for this reading of him is there in the show, even if there isn't as much (in general and in proportion to the parts where he is presenting male). I do think creators wanted fluidity and went for it. The interpretation is canon-supported beyond some word-of-god.

It's still challenging and weird for me to think of Crowley in a femslash exchange, but since NB is allowed and someone in fandom wants to dig into this, I think it's fair and I'm willing to be convinced.