And historically Sage always dressed like the Black Queen even though she didn't technically take that position. It wouldn't be a stretch for her to be on the HFC, and it's quite possible with her being involved with the Krakoa intelligence division (X-Force) she might have been asked to be the Black Queen so she would have access to the outside diplomatic, political, and economic connections.
Why is there people saying Jean? She's already in X-Force, which seems like an actual permanent job. And I just don't see her being in the Hellfire Club.
What about that cranky old women from the Captain Britain comics. The really scary human one. I forget her name.
It would be cool to see Storm as the the Other Queen of the HFC.
But, I think it's highly doubtful Storm would go for that position. It's most likely Selene.
Jean, definitely.
But my dark horse choice would be someone totally unexpected, like Alison Blaire.
Hickman doesn't do unexpected casting, he does unexpected connections.