I hope you find this idea useful. I guess if your bulk roll won't fit in a standard bulk-loader, then you'll need something like this. But if you do copy it, I suggest cutting out the top-middle section in a Vee-shape which I drew below:
Originally Posted by semi-ambivalent
The purpose of this suggested cut is to prevent the wood from touching the film in the image-area, so it won't put scratches in your pictures.