So in this thread: http://originaltrilogy.com/forum/topic.cfm/SLIPSTREAM-image-request-AND-WIDESCREEN-preservation-request-Sky-Movies-subscribers-see-posts-4-onwards/topic/9379/

focuspuller claims to have a Japanese LD rip of the movie which is the only know copy of this movie in widescreen and it needs to be color regraded. As far as any other sources or posts on the internet, (aside from the DVD you mentioned in your post) they do NOT exist. The supposed HDTV transfer is just a stretched copy of the P&S edition and it's quality sucks as well. The "HDTV" transfer I'm referring to is the crappy youtube post.

I know that's not what you wanted to hear, but it is what it is ;o)