I agree about folding the "baby boom" tracks into one; I forgot about that one. That would definitely work. Agree also about Empire's 6-track master; I now remember there were audio differences between that and the 35mm presentation.
Out of curiosity, does Dolby still use noise-reduction capability for DVD soundtracks? If so, then it would probably be pretty easy to present an original-sounding 2-track print on disc, albeit w/ the limitations mentioned. Still, I'd be fine with it; I'm a huge fan of these films (the originals, that is), and I've always wanted to hear how they "originally" sounded like, especially ANH's mono mix.
Although I've only recently begun posting here, I've been reading posts on this site for months, and I'm impressed with everyone's insight.