There's a reason KFC makes such a big deal about the 11 secret herbs and spices that go into their original chicken recipe. The seasoning is the most noticeable on the skin of the chicken and it didn't take a South Park episode to tell us that that's the part everybody who eats there really wants.
So even though such a request might have the power to make our arteries disappointed in us, many of us secretly want a way that we can only have the skin.
And nobody seems more aware of that than KFC themselves.