Flying with the joystick sounds like a cool idea. Wouldn't mind setting up something like that with an actual seat and monitor arrangement like some of the examples i've seen done with the Xplane or MS Flight sim 10. Would take a little getting used to knowing the plane is still at the mercy of a good signal. Spend some time to fully test any equipment before integrating into the plane. No reason not to test it, try it out on an r/c car if you've got one or similar at first. Worked out the bugs on mine that way and gave my son a workout by chasing him around the outside of the house while I was using a monitor in a closed garage.

As for the electronics design, quite excellent if you have a decent background in how to put together a system that works in all the details you're discussing previously, you might have a viable product down the line that might spark some interest in other fpv'ers. Keep the ideas alive, always room for innovation...