Ive had a few people ask me how Im such a wizard genius and got this effect. Its pretty simply done by running 35mm through my medium format Pentax 67 which takes 120 film. Adapting 35mm can be a bit tricky as its not designed to go through larger format cameras so I got some 3D printed spool converters off eBay. This basically fills the space between the canister and the winding mechanism and then it can be loaded like standard 120.
However because its canister film it requires re-winding back once you're all done. With a bit of practice and patience you can do this in a darkbag carefully and then develop it as you would any other c41 process film.
Shot on Kodak Colourplus 200.