Going past the engine swap to 3.4L, supercharger?

Well, you could supercharge it since the engine is the same, but it wouldnt do much good. The supercharger units are made for a 2.5 displacement, a 3.4 would require a lot more air to be pushed through to get the same psi. So a 2.5 supercharger pushing 4.5 psi might only put out 1 psi on the 3.4. Just an example, I dont know the actual numbers.