I just received a copy of the 1991, Japanese P&S laser disc release of Star Wars, and can confirm that it includes the 1977 Theatrical stereo mix in digital. I will be ripping it tomorrow and syncing the sides over the next week so that I can share this, as I believe the only sources up until now have been from analog laser discs.
Here are some links to info about this disc:
http://www.lddb.com/laserdisc/31580/PILF-1236/Star-Wars:-A-New-Hope-(1977)