*sigh*
you’re way overthinking it. Put a harness of some sort under their clothes with a cable out their back, then put the camera facing the actor. No rotoscoping required. Also, this reference point creates an easy cgi plate. There’s no complicated perspective.
btw, you’ll need at least 3 people to pull them back if you want a good pull.
Practial ALWAYS lookes better. A good example, the new star wars movies. The force jump wasn’t even done with trampolines. 4 guys held a 2×4 and lifted as fast as possible. That’s with a billion dollar budget too.