No - at least not in a cost effective way. The 8P stalk plugs into a central steering electronics module which on the A3, fits snug to the steering column. It doesn't fit the A2 and so the stalk can't come out of the trim panel at the correct place.
I have a separate stalk on my TT and also the integrated stalk on my A2. I like both equally and in fact the A2 stalk is probably less complicated, bizarre as it sounds, because the number of times I've either signalled using the cruise stalk, or flashed my lights using it is not funny.
Stick with the original A2 stalk - it works and it's very good.
Cheers,
Michael