The theory or question was does the HHKB with a Japanese layout, when hooked up to a computer set to US layout send the US expected key.
Ripster, your answer was well at least the Japanese layout Filco Zero, hooked up to computer set to US layout sends the expected US layout key, therefore so should the HHKB with Japanese layout.
Using that reasoning, then the 91UBK-S with a Japanese layout should send the US expected key, when the pc is set to US layout. If this is so, then aside from wishing it had an embedded numberpad - I should be able to not have an issue, with the 91U. Haata has Japanese realforce . . maybe I should go hunt for his comments on the all 30g Realforce. Being full sized shouldn't make a difference.