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@AmercianBoy
dbr - I just swapped a Suntour (111mm JIS) for a TA (118mm ISO) and got roughly the same chainline with my Stronglight 49D cranks (ISO). BUT the cranks simply would not sit right on a JIS taper, and would creak under load, the difference between them depends on how willing you are to force the fit, hence I guess the "about 4,5mm further".
So the calculation may be correct but who knows/cares? A Campag road double is sensible given that Miche have probably followed Campag convention. If you can borrow one to try first, that would be ideal.