Heated windshield

Moin, I have not ordered the heated windshield because of the ticking of the preheater, but notice now that in autumn/winter this would still have made sense because of their tendency to install it. Like chance, I first got a really great stone in the windshield on my last motorway tour, therefore the question: If the windshield has to be changed anyway, a relatively uncomplicated exchange goes through a heated windshield, because the cables possibly. anyway or basically are pulled with all vehicles and then only the switch would have to be retrofitted? Thank you in advance for every information!