Amazing; the minds of GM at work.
I understand Saturn/Saab since they both have unique warranty claims processing.
Except for the t/case and axles, there really is nothing unique about the H3 that a GM dealer could not fix. In fact, engine/trans they have the tools and parts available to repair. They have the service procedures in eSI for all vehicles, and they are on the same warranty system (other than for H1).
I suggest calling the assistance center and writing a letter to the Vehicle Line Manager.