Relocating the head unit up two slots, above the Heat & AC controls, makes some sense for increasing ease of use and readability, although you'd have to move the AC vent or lose a lot of driver cooling, and that could turn into a fair amount of work. In a non-AC truck, this would be a great idea, and fairly easy.
Moving the head unit to the right would mainly make it easier for the passenger to see and fiddle with the stereo, which is not a positive thing at all in my book.
The driver is McGarrett, and runs the show. The "shotgun" passenger might be Danno, running the show only when McGarrett is out of town, but when the driver is in, all passengers (including the "shotgun" seat) are Chin Ho - they don't run squat, not even when Steve has been kidnapped by Wo Fat.
On a related note, that middle location looks like a great place for a center channel speaker.