I remember a guy who worked at a TV station having Digibeta copies of the original cuts back in the 1990’s. That would be one way to get a (720×486) or PAL (720×576) version. That would be a pretty solid source.
I remember buying the Japanese laserdisc when it came out as it was rumoured to have an extra scene in it back before forums could confirm. Didn’t see anything new but the quality was superb. I’ll be coming by with a DM for a link once I’ve become a regular here. Great site, great community.