I mentioned in the HODS Long Version thread (and at the Fest) that there was a possibility that the Hong Kong release would also have been of the longer version the Japanese released...
I've been able to touch base with the Hong Kong Film Censorship Authority and have been given the lowdown on their release.
The Hong Kong release, sadly, was identical to the US release, running 8708 feet (97mins), and "was approved for public exhibition without further cuts, subject to the condition that it would be advertised as not suitable for children."
That narrows the search by quite a bit, leaving Japan the only known territory to release the longer cut, but at least this information came fairly easily.
More updates as they roll in.