As an equivalent substitute for the discontinued Arista II Ortho Lithographic Film I use FO5 Lith Film from Banse & Grohmann. Speed and tonality are almost identical, only the antihalation layer is different - to hold the developer clear, a short prewash is required.
Probably this film will be soon available in USA under a different lable.
Reversal development SE6 Blue 1+20/dichromat bleach
Ammonium Palladium POP (Mike Ware´s formular) on Fabriano Artistico 9 minutes