Since this is such a general question, moving to General VW/Audi Repair.
If I had a car with a stuck motor, I would try to open the motor using a
current-limited (to about 10A) 12V power supply. Applied directly to the motor leads in one direction, it should cause the motor to try to close. In the other direction, it should try to cause the motor to open. If that didn't open it, then I there would be no choice but to mechanically disassemble things.
As for disabling the system entirely: I'd get a
wiring diagram and pull the fuse(s) that supply power to it. This will certainly result in fault codes in other modules as well as some warning lights, but I'd expect the car to remain driveable enough to get it where it needs to go to get repaired.