Doubt Brabus will work with VW cars when they're known for tuning Mercedes-Benz, Smart, Tesla and Maybach vehicles. All very high end and performance oriented to begin with, aside from Smart.
If not them then ABT or some similar tuners needs to get on board. Its hard to discount how great of an opportunity this is. IMO its the next best thing to owning an Audi A3... except here we have adequate cabin room to seat 4 without issue.