A 70mm bulk loader is one thing, and it's fine, I'm sure, for loading 70mm film into a cassette. If you have a back for your camera that accepts this and you can find a source of 70mm film in the emulsion you want, then you are good to go. But the OP wanted to know about bulk loaders for 120/220 film, and that, I'm afraid, does not exist. Where would one source the required paper backing for 120, or paper leaders for 220? Then there's the problem of taping the film to the paper. A difficult thing to do in the dark I'll bet.