I'm sure this has already been said, but anyway: Why don't Paizo does the same that Games-workshop did with the "dark elves"? I mean, they changed a little the name (from Drow to Druchii), a little the physical characteristics and the lore, and that all! The same happened with the "dark dwarves"...
Related to the post: I'm not going to complicate it too much. I will use the common elves as dark elves, and that's all.