seriously... there are tons of performance benefits that can be had with nitrous on a supercharged engine.. there is an faq in the tech articles wither here or on tccoa.. i would recommend perusing those first.
I think a direct port nitrous setup would be the safest, most efficient way to run it. You would have to raise the blower I'm sure, but that is not very difficult. I don't know of anyone who has tried in on a supercoupe. I don't know a whole lot of people who use direct port at all in fact.