It's getting quite hard in EU countries to do BW reversal, except with the official kits. The problem is the bleach. Sulfuric acid is banned in concentrations more than 10% for consumers, it is considered a precursor for explosives, Diluted H2SO4 is not sold anywhere. Potassium dichromate is totally banned, and the alternative, potassium permanganate is listed as 2nd schedule narcotics precursor, and is subject to controls. Yes, there are kits available, but as always, they are very small and expensive. For instance, one Foma kit has the capacity of developing 8 rolls of 135-36 film. Not bad, but for cinema film it is a joke. It is one 30, roll of 16 mm film, and costs about 50€,