Sorry, but there's simply a physics problem there. If you zoom out, you're changing the field of view. They're inverse functions. And if you do so, you'll get distortion around the edges of the frame because you're trying to map more of a sphere to a rectangular viewport.
The only other way to be able to see more of the cockpit is to move the camera's position. If you don't want to be looking at the back of your own head, that means the chair and pilot models would need to move back as well.