Ha ha. I was just thinking of this film yesterday. I have a bootleg DVD I bought off an eBay-seller about ten years ago. It was transferred from the US VHS, but is reasonably clean. I wasn't aware of the Japanese release, so I am looking forward to seeing your project finished.
By the by, we are likely the only two people on the planet who will find interest in this project. I tried showing it to my kids and they hated it :-)