The Bearded Tesla Guy on YouTube swapped a heated wheel into from one of his Tesla's with it, to another Tesla of his that didn't have it. TBH, I don't recall if it worked or not. You can easily find him on YouTube. Obviously, Tesla could certainly make a retrofit available, but to date, it seems like they haven't really been that interested in potentially generating extra revenue buy offering retrofits on things like this, passenger's side lumbar support or matrix headlights. Or they've determined that the cost to develop isn't worth the money for the potential revenue that could be generated.