No idea with VAS.
VCDS / Vagcom is fairly simple:
01 - Engine
16 - Steering Wheel
Edit 2nd to last digit to support CC
Close but not quite right.Is it really as simple as fitting the switch then -
 Engine / Coding / 11463 (to enable cruise)
 Steering wheel / Coding / change my original code 04012 to new code 04042.