Hi Rob Can't get my head round what you are trying to do ?
You can put a 2mm pitch thread on practically any O.D. (within reason)just make the depth correct as per your Zues book, lots of manufacturers make odd size threads on some of there equipment but they would manufacture special taps to match,are you trying to make a nut ? or a male thread on 30mm bar ? I do have some info on specials but i think they are Imperial, not sure if there is info in Machinerys Handbook, i have seventeenth edition.
Mike