SF:

just a legitimate thought, all jokes aside.
RB is a multiple stage metallic AFAIK, like a pearl.
if you are the sort of enthusiast that chamois-es every last water drop,i dont think you'll be happy with just the door painted. they will have to blend the whole side. you will see the colour change on switching angles.

back in 2005 my silver STI had a small mark on one door. the local gun slinger said sure, no probs, flick the gun.

short story, 4 visits later, and they had to refinish the whole side of the car.

no doubt, darker colours are sensational when clean... i really like the mocca in the Passat range...but one drop of rain....