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@A_EF
Thanks. Thinking more about it I agree I think I'd feel happier getting the right size instead of getting someone to ream the head tube... retain the integrity of the frame and keep it proper thickness, even though it's only a couple of mm.
Having said that I removed the cups this afternoon to double check measurements and managed to press the lower cup back in by hand, so it's a very loose JIS 30mm fit. It's snug enough once it's in there (esp if I add a dab of loctite when fitting finally) but doesn't require a press to get it in. Can't help feeling a 30.2mm cup would go in.