Update:
LDS is having a hard time getting parts, it appears SP is the problem but he's decided this is a challenge so is exploring other avenues. I ordered the service kits, exhaust diaphragms and poppet assembly's from VDH and they are on the way. Fingers crossed the orifices are ok, Bryan advises he has some chrome plated brass ones on the horizon. Hopefully I'll get these regs in the water within the next couple of weeks depending on shipping speed.
Assuming my understanding was correct and nothing was lost in translation, the Japanese E-bay seller wouldn't combine shipping and was still charging US shipping fees per item despite the fact we both live in Japan where domestic shipping is very cheap.