So how hard would it be to transplant Blades in the Dark characters, faction game, etc into a Alt-History Lovecraftian London?
So long as we acknowledge the existence of the supernatural and steampunk technology the game should run with just a bit of spackle. Reconfigure the gangs and change the fringe cults to historical societies like The Golden Dawn or Freemasons; that should do it.
Or am I missing the forest for the trees? Any and all advice is appreciated.