Haha, I had thought of that aswell.. But I dont think it'd work that well because of the difference in the cables.
I know how they actuate, but the problem is, they arent like most twins, where everything is linked, only the throttle is linked. The choke mechanism is on the same side for both carbs (left if looking at the inlet), and there is nothing going through the body to create a linkage.
Some sort of mechanism would have to go either underneath the body of the carb, or over the top.
So I'm struggling a bit at the minute