The tetenal kits may still be available in europe. I don't know if that's just some remaining stock or what. But that's not going to help here in the US.
Actually cambridge camera still has them on their web site.
I ordered one just to see what would happen.
Checked with them today and they said they were waiting to hear from their importer.
I don't think there is much hope.
Guess I should have paid more attention to your name and picture. Obviously a cine person. I never did my own reversal 8mm because of lack of a good tank and reel. Out of curiosity do you have a tank/reel that takes 25 or 100 feet?
Citrazinic acid: I am continue to use my 1# supply purchased way back when, when Kodak Organics was still in business. I suspect it is available as reagent somewhere, but expect it to be expensive and require a commercial license to purchase.
HQ monosulfate isn't available anywhere that I could find it, but PE contributed to a thread recently on making it in solution. Crystalizing from solution is evidently not practical. I have used with some success alternative formulations for E-6 based on MPQ (metol-phenidone-hydroquinone) that can be made to work quite well, but will not duplicate the official processing.
By denying the facts, any paradox can be sustained--Galileo