Steve
I do have heated grips on my bike. The Heated grip with damper is a direct replacement. This means that it isn't as easy to fit as the wunderlich restricter which just replaces the handlebar weight, as the whole heated grip assembly including wiring has to be replaced, which means lifting the tank etc.
I get to keep my old heated grip as a spare. which I could sell on if I wanted.
Whether BMW do a Non heated grip with damper is a different matter, I don't know, but then they usually cater for all markets.
Ian