Loading up long lengths of film onto plastic cores and/or metal/plastic spools specifically for the film loader is definitely feasible. Someone surely has some cores or spools. But, I have always tossed them.
This is exactly what I do. I use a piece of board with two bolts sticking out of it. The larger roll lies on its side. The empty spool on the other. I fashioned a crank out of aluminum stock which has a small bolt which fits a depression in the spool. Work likes a charm and is quite fast.
A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.