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@pip
Just to be clear I wasn't saying that you can't use ISO cranks on JIS BB:
http://www.sheldonbrown.com/bbtaper.html
Its just that it will deform the Campy crank, so if you use a Campy Crank on a JIS taper, you probably shouldn't then try and run the crank on an ISO taper. You may be able to get away with it, but its likely the fit will be poor, leading to creaking and other issues.
My advice still is for Protoype to identify the taper of the spindle his cranks are sitting on and use that for the basis for working out which BB he needs. It sounds like its probably ISO, otherwise the cranks would be really really far out - in which case any symmetric 109/111 bb ISO BB should do the job.