I can ask the question, but I think they will just ask Fiat for the uptake rate for xenons on Bravo. That option is very rarely taken up on Bravo, so commercally, it is probably not viable.
You will probably now all say "but this is a sports car and I want them!!!" which is a fair point, but Abarth is still a buisness that needs to make money. I have no idea how much it would cost for the R+D department to modify the car, but its never going to be cheap.