Thanks!
Maybe satanika's access to the JP laserdisc could get things started -- probably the JP widescreen laserdisc overlaid by the US fullscreen laserdisc in the hard-coded subtitles area (with color-matching, of course).
Or ... Pineapples101 has a blog and indicates access to the JP laserdisc. Might be worth a contact, too.
http://movie-memorabilia-emporium.blogspot.com/2014_02_01_archive.html
.
I really like Space Kaijuu's suggestion of film ...
eBay - SLIPSTREAM: 35mm CINEMA MOVIE FILM TRAILER:1989: Mark Hamill, Bill Paxton
http://www.ebay.co.uk/itm/SLIPSTREAM-35mm-CINEMA-MOVIE-FILM-TRAILER-1989-Mark-Hamill-Bill-Paxton-/221532044285
Granted, it's only a trailer ... but it could be a good color-correction source. If you get it, definitely post caps!