Hah, I was just about to suggest Alien as a source for the opening Fanfare. I'd never even thought of switching that around, but I have to say I like the idea. Bravo. This raises a question of music quality however. One thing I've always noticed between the PT and the OT is the music. The PT has much higher quality recording, so the music has a much ricer tone and smoother bass. You can hear this the most when comparing the opening crawl theme. If your worried about continuity you may thusly want to consider changing the opening music to the original as well. Once the film has started then the action on the screen would distract from the difference in quality, so you could just fade into the original Episode III score and not notice the difference.