Well, shit, that actually sounds pretty cool. I doubt it'll actually happen, but I'd be down with it if it did. I'm more inclined to expect Carrot to develop her electro abilities to an advanced degree; especially if she's sticking with the Straw Hats for the long haul.
I'm just not sure how that will be done to differentiate her enough from Sanji, given both have elemental abilities and can jump around the battlefield to an incredible degree. I suppose a focus on her use of electro through her upper body would be an easy option in that regard.