Since you couldn't carry more weight than two duckies apart, I'm guessing that the major advantage would be to have a more stable and powerful rig for the rough stuff: with two paddlers you have more blade in the water more of the time, hence more power. And you'd be a lot less likely to flip.
But to switch from the double rig to single IK's, wouldn't you need to carry both types of paddles: canoe and kayak? Or do you have breakdown yak paddles with those handle-plug fittings, to convert them?
I was thinking that if you had the breakdown yak paddles with removable blades (e.g. AquaBound) you could use the shafts to rig your R-2.
Anyhow, it sounds like you're thinking—