I'm glad you're not using the American shots of Jack and Lily with the unicorns at the end, which were obviously lifted from earlier in the film. I never understood Jack putting the blindfold on Lily to see the unicorns at the beginning (didn't he just say he trusted Lily?). The shooting script explains this as Jack not not wanting to give away the location of the unicorns. However, the American cut at the end makes the whole blindfold thing make no sense, which is typical of a lot of the edits from that version.
I have the Jerry Goldsmith soundtrack. It's very easy to find on amazon for $10 and I also downloaded it to my computer. The unicorn horn being reattached is something I have always wanted to see in the director's cut. I don't know what to do about the music as the Jerry Goldsmith score for Jack diving and finding the ring (13: The Ring [at about the 2:25 point]) always seemed to cut off abruptly in the movie. There's more on the CD but not as much as I thought would be needed for the inserted scene. I guess you'll have to decide for yourself. I think the Legend faq site mentioned that a part of Goldsmiths score composed for a scene was not used and instead another piece of music was tracked from another scene (even in the director's cut). That would be another good thing to look into.
Another thing you probably noticed is the the text on the American version's credits is bigger. I find that much easier to read (but a lot harder to hear because of that stupid Bryan Ferry song!) and was wondering if it would be possible to use those credits and maybe add some of Goldsmith's score from the CD that was unused in the movie to fill in the longer running time.