I have seen a video on youtube where they did all the chrome by painting - I too wondered about getting paint to stick to chrome, but satisfied myself eventually that it probably is not actually chrome and what we are actually looking at is some sort of Audi alchemy on aluminum or paint finish!!!
When they took the trims off it looked fiddly but possible, much like taking any trim to bits, Audi design it to be put together quickly on the line and worry about getting it to bits afterwards!!!!