I remember seeing a simple setup very similar to this, but the operator adjusted the camera (and a single screen was used for feedback) but the effect felt like a zoom-in / flyover of terrain. I can't find that video any more, could someone point me to it?
edit: here's something from, wow, 15 years ago. It was like this but more landscape-like in the flyover. https://www.youtube.com/watch?v=eD9rr0gTLSU