>>30045

Honestly, you may be over-complicating your idea by a lot. MiniMax will easily take two input images and can handle green screen to combine them together properly.

This is just

<Subject 1> stands on the stool, observed by <Subject 2>
Noose drops under the influence of gravity, swinging from the pivot point, swings between <Subject 1> and the camera. Rope straightens out under influence of gravity. <Subject 1> stands on the chair, frozen.

Video input is slow and so this took 4m to generate (image only is about 120s) and it needs to be upscaled, but even that should not take over an hour on your HW.