hmmm yeh that guide does seem pricey! And certainly doesn’t look like it will do 35mm
Im using the carrier from the enlarger i got given to hold the film (seems to be working well) fits 135 perfectly (with borders), fits 6 x 6 (no borders) and nothing bigger.
Pretty happy with my 9000F for medium format so may stick with that and use the camera for 35mm which i think looks much better. had a bit of curling issues with medium format but a bit of toying (and using that supplied card thing they give you ) can usually get it sorted, if not I flatten the film under books for a day.