Why can't you put the part that clamps the choke cable onto the rear carb. Sort of swap positions. I just looked at my carbs, and this looks very plausible. I'm talking about the steel part that clamps onto the exterior of the cable. Leave the brass part of the actuators in each respective carb. Actually, they are the same. You would also have to flip the rod mechanism between the two carbs so you could attach the interior part of the cable.
Of course, you might have to now SHORTEN the cable so it doesn't take a wild bend. /ubbthreads/images/graemlins/hammer.gif