PotC, Buffyverse: How well would they mix?

Just a random thought that occurred to me during coffee break...

What if PotC and BtVS were actually set in the very same fictitious universe with a nice, powerful Hellmouth located on some volcano island close to Jamaica?

I guess this would make a good explanation for the unusual amount of supernatural activities going on in the Caribbean waters. The curses, the undead and resurrected, the abundance of prophecies, destiny and magic. Lizzy Swann could be a dormant Slayer. A still single Darla with Angelus not yet sired, could run into Norrington...

*sighs* Too bad I'm too caught up in real life responsibilities right now to think this one through properly.