I hate to think what requirements there would be today for someone to sit on the wing of a taxying taildragger.
You'd at least need hi-viz pants as well as top, a 'proper' seat and four-point harness, and be fully qualified in semaphore. If the wing was more than 2ft above ground level you'd also have to use a scissor lift to get up there since ladders are no longer appropriate for anything in the workplace....
However
blue up's suggestion of a camera is reasonably achievable, although I agree with
ATC Watcher that the spinner would not be the best place for it (safety issues again - could cause a neck injury trying to watch the result
I've no experience in a P51 but I wonder if a small camera mounted inside the cockpit at the top of the screen would have sufficient field of vision? This would avoid any issues with externally mounting something to the fuselage or wing, and it should be possible to utilise wireless in order to stream the video to a tablet or 'phone.
Not wanting to excuse lack of basic skills such as weaving etc, but the ergonomics are terrible and if modern tech can save machines (and possibly lives) it's worth considering how it might best be achieved.
FP.