To program the car the OBD port needs to be live, not sure on the situation on the A8 and these "Dealer tools" but VCDS does not work unless the ignition is switched on, and you cannot switch the ignition on unless a valid key is within the car.
One possible solution maybe to move the OBD port to somewhere else and place a dummy one that does nothing in the usual location, or even rig up a switch to disconnect the Can H and Can L from the port.
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Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
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