I just did this on my GTI with DSG.
The loom etc. was already there and the button faces were just blanked off.
, when they're including the hardware from the factory, you'd think they'd throw in the buttons. How much more could they cost!?
Anyway, your car being a DSG should already have the correct (highline) controller (if your car has paddles) and those buttons should transfer over and work immediately without any coding just as mine did.
Best of luck.