I have adapted the use of Paterson reels and a single reel tank centre tube for non standard film widths wider than 35mm. I dont have a solition for narrower than 35mm other than to develop them like spagetti in a 5x7 or 8x10 print tray in absolute darkness.
For wider than 35mm but not standard
I don't 'click' the two halves of the Paterson reel together, but rather leave them to slide 'film width wise' freely' in the aligning channels. I slide the samller diameter half reel on the tube first, and then inner increase the diameter of the centre tube to match the diameter of the smaller rel core with self amalgamating electrical tape.
Then the larger core diameter half reel is slid into position, and I then gingerly load a waste length of the wierd width onto the reels.
At this stage I usually have pre spooled a few big elastic bands on the smaller shaft, and partially roll them onto the larger shaft to keep the width between reel halves in place on the first load.
I also roll another elastic band down the centre shaft to keep the rele half from wandering too far out.
I finalize the width with some SAPT around the centre tube on the outside edge of the larger half reel, and where the two reels may overlap to keep that width in place.
It is a bit cumbersome, but it allows me to to process bulk loaded 70mm film, that I cut and spool on dowels or widened 35mm cassette central spindles to use in some converted roll film polaroids, and older brownie box cameras.