I'm afraid I can't cast a vote until the OP sends me a tray of said marshmallows to sample.
Seriously though, I think it sounds tasty-- one of my favorite combos lately is chocolate, caramel and sea salt, and this kind of sounds like a spin on that.
But if you're not sure, why not make a few in advance, and try them yourself? If they're tasty, you can make more and add them to the mix, and if not, it sounds like you have lots of other ideas.