Alternately, have some hyper-specific chain of events the player has to complete that run on Monkey Island Rube Goldberg Logic that results in this happening at the start of the final battle, wiping out Drac's first phase and skipping straight to his monster form.
Death: REMEMBER TO TELPORT M'LOR--
Dracula: *slips on a banana peel*
Belmont:
Death:
Dracula:
Dracula: PLAYTIME'S OVER. GRANT ME POWERRRRRRRRRRRR
Death: THIS IS WHY WE TELEPORT M'LORD.
Yeah, the Konami that gave us Kid Dracula and Maria Mode in Rondo would have totally been willing to add that as a joke