For Disney, they had a, basically, static scene, with known factors for the materials and props used and for the viewing angles of the guests, for home haunters and most pro haunts that portion of the formula is different from haunt to haunt. Part of the problem or challenge is that you are trying to match a distortion for setups that aren't necessarily the same as the one you used as a basis, an issue if you are going to sell your services in creating the videos for this kind of thing. If you can set standards for the setup; the size, type, and location of the projector, the size and make of the crystal ball, the foam or sculpted head, the viewing angles of the guests, etc., then creating these things and having guaranteed happy buyers would be a whole lot easier to achieve. The material and size of the globe can make a huge difference. The curve of the glass and plastic, and the thickness of the material can play a huge factor in the amount of distortion you have to work with. TO a certain extent, that curved surface acts as a lens, and like lenses on a pair of glasses the distance they are held from the viewer can greatly change how things appear. That is one of the reasons Disney tried to do the effect by projecting from the interior of the bust, it would make the distortion of the globe irrelevant, and help avoid any issues of the projection unit from being accidentally bumped or moved during the routine cleaning and care for the attraction.
If you create videos, I'd suggest that you keep "clean"/undistorted versions of the seances to offer different levels of distortion. Try your versions on several different sizes of globes and busts, and set standards as to how they should be used.