Love the idea. Probably best to di it once the warranty is over or if you buy second hand though, as I suspect when you buy the heated seat car you have to sign an EULA like Apple products and agree not to tamper with the components or lose warranty and rights.

Quite simply, subscriptions for products have never existed in the history of humanity and shouldn't exist. You either sell me something or you rent it. If you can afford to give hardware to me for free, as long as it is disabled, someone is taking the piss.