Damon anything is possible if you are in the right place at the right time. But if you want to replace the front end just to put on a bumper kit for the newer model that really would be a pain in the but.
1. 08 and up Hofele front bumper skin 2,000 and up
2. Left and right headlight housing if you have bixenon you talking 1,400 to 2,000 plus
3. New left and right fenders and possibly wheelarch liner could be another 1,500 or more.
Most cars are involved in front end crashes, so hanging around and waiting for a relatively lower volume vehicle to be T-Boned or rear ended may have you waiting to realize your dream for quite some time.
There are not many distibutors of Hofele part to begin with so special order a massive piece may add to the cost of the part.
if you want to make a subtle change to the front of you touareg that you already own would be to go with the Hofele Route GT front end. which is a direct swap and you can have the giant sheild look paint onto the bumper similar to the GTI or the current Audis.
Or your can just do that paint treatment to your current bumper and have folks scratching their heads like what year did that on front end come out.