These shells are available on Amazon Prime (same day) if you wanted a weekend project to play with.
£10.99 - 8 left in stock.
https://www.amazon.co.uk/Buttons-Replacement-Maserati-Quattroporte-GranTurismo/dp/B0B9JPB4CS
Grigio QPV on A428 past Caxton Gibet towards Cambourne at 11:28…. Only glimpsed it and was not in my QP5 so had to check on dashcam that someone hadn’t stolen mine :)