Retrofit heated rear seats

[illegitimus]

As title states, has anyone ever attempted to have it done? I know, rear heated seats come as an additional option from the factory and can't be retrofitted at a dealer. I have a basic cold-weather package and no rear heated seats. this winter we'd been going to ski up in the mountains and a couple of friends, incidentally, riding in the back, mentioned it (I wonder why...). Thanks, guys, for any feedback.