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Machine the crown race down to the ISO diameter (26.4 mm) and use an ISO headset instead. The head tube diameter is close enough to be within tolerance. Or use the Park Tool CRC-1, details here.
Yes, we are going for something similar. First issue is JIS headset... omg I hate old bikes. Anybody have a cheap functional JIS headset 35mm ish stack, 30mm OD, 27mm ID crown race?