Ilfoflex is no more, as is Ilford as a manufacturer in Switzerland. That leaves only Fujiflex which can be reversal/cross processed, as it's RA-4 emulsion on a polyester base. Shame that Stephen Frizza from Australia probably won't chime in. He apparently did a lot of testing of both Ilfoflex and Fujiflex and got some great results. I do intend to buy a 50" roll of Fujiflex from the UK, but the price is such that I would very much like to share the cost with two or three people, by cutting the roll into sheets of any desired size. I have a cutter made for just the task, a heavy-duty Rotatrim Technical T1250 (despite the name, which suggests 125 cm, it fits 50" length exactly).