Do you mind if I ask what is an air switch?

I have all of that with my main sink except that mine is only a hot dispenser and the sink is 10" deep (center rear drain, BTW) -- not much different. Reread -- my air switch in on the prep sink, but that wouldn't really make much difference -- inside the cabinet it's just a small air tube running down and it's a small disc (like setting down a vitamin or medium pill bottle) next to the sink. You also have the option of setting the air switch on the side of a cabinet or inside a pullout or drawer. It's one hole center for the faucet and one on each side for the dispensers -- then the air switch where ever you decide to put that. I also have my trash and recycling under the sink and planning the space underneath was much more of an effort. The only issue above the counter was making sure I had depth for the sink plus the swing on the faucet handle. It was very close.

An air switch is an in-counter button for the disposer.
Yes you can do all four, but think about their relative locations.