The heated windscreen can be retro fitted.
In fact more or less anything can, they're like lego in some ways - only limiting factor is cost of retrofit. E.g. retro fitting folding wing mirrors is stupidly expensive but retro fitting OEM bluetooth is cheaper than the option price.
The bigger problem than getting them to agree to pay parts costs for the retrofit is getting them to do the retrofit. Often you have to either DIY or go outside the dealer network.
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