Do you mean have the button on the shifter be at the front instead of the side or do you mean paddle shifters on the steering wheel? I haven't been in a new Tiguan so I'm not sure what they have.
If you mean paddles then I'm pretty sure the RS6 of the same time period had a paddle shift steering wheel.
If you mean the actual shifter I bet you could make it work. I don't think you'd need a new trans but you would have to fiddle with how the lever is moved from selection to selection. It will probably require some trial and error and some fab work.