Not sure if you've seen this thread, but there might be some helpful information here: http://originaltrilogy.com/forum/topic.cfm/The-Prequel-Edit-Problem/topic/15331/
Check out the video from this post: http://originaltrilogy.com/forum/topic.cfm/The-Prequel-Edit-Problem/post/637425/#TopicPost637425
Obviously it does sound weird in places, but it's something.