I’m not sure it’s impossible, hopefully (hopefully)just really complicated and time consuming.
Building a model of the Kenobi hut interior to a scale large enough to manipulate the light to match the Dagobah set footage from the existing version. Getting a body double for Mark so the construction of the saber can be redone without the issues that deleted scenes have. Making new transparent images of Sir Alec with the trees of Dagobah removed.
It’s possibly all doable but who’s gonna fly it kid… 😉