I'll take your word for that but honestly, I don't see how that would work. In addition, good luck with removing your heated grip per the instructions they give without damaging the heat element. From what I've heard, it doesn't take much twisting or stretching at all to ruin that element. Finally, this device looks very similar to the BrakeAway throttle lock and they have this to say on their site:
NOTE: The BrakeAway cruise control is not compatible with factory or aftermarket heated grips on any model.