That being said, I can’t honestly think of who I’d use as an alternative, assuming we can’t create new characters. While Spider-Man has a lot of rogues who could technically fill the role, they’re still pretty low level themselves which defeats the point.
My only solution would be to put the “Kingpin” further in the background and have Spider-Man deal with proxies. It would help sell the
untouchable vibe that Kingpin/Tombstone present that while Spider-Man knows that a kingpin exists, he’s never even met him.