I do recall seeing people posting some of the Hyperspace content on USENET way back then. Have you looked into seeking if that might be in the old alt.binaries.starwars group?
That would be a possibility - you’d definitely need someone extremely savvy at extracting those videos back then, and the posters on a.b.sw might have been just the right people to have done it.
Unfortunately, I haven’t had access to Usenet in many years now. I’m not even sure where I’d start with that one.
–SKot