Ever think about adapting the story to the CV universe Plot?
Maybe one day this idea could become a real fan game. Dracula on the move in London and being hunted would be crazy. It'd be a game with multiple Dracula battles.
I have, though I think people would dislike my headcanon greatly because it tries its darndest to fit into Castlevania, and not so much for respecting Bram Stoker's original.
The characters themselves (Mina, Lucy, Arthur Holmwood, Dr. Seward, Renfield) would mostly be there, with the spotlight on Quincy and a Lecarde -- possibly a new character. But the plot would take major turns from Bram Stoker's, starting with Van Helsing, who would be primarily a seasoned vampire hunter, and expanding/changing a little the roles of the other characters.
There would also be the acquiring of estates as a plot point, but it would not be by Dracula nor by the reasons on the novel. Castlevania's Dracula is a genocidal demon lord. He has no interest in "acquiring estates" to play cat and mouse when he has a demonic castle filled with traps to do it. Though other parties have uses for acquiring estates to further their agenda of reviving him.
I see this story as I see 1999. Two big holes offering seas of opportunity for the series.