When you say sell them separately I assume you mean you're selling your Pirelli? As it's a special edition I would probably sell the car with the alloys. You probably stand to lose value on a special edition car by not having the correct wheels.
I for one would walk away from any Pirelli that didn't have the right wheels supplied or fitted as they are hard to source. £800-£1000 to get a set...if you can find them. In the defence of the Pirelli alloys the look of the wheel is improved with a colour change. But then I would say that!