For the ending, you can let the score play out as intended instead of cutting early. It builds to a nice climax and then you can quick cross-fade audio to the credits. I was able to do it and it plays very convincingly.
You will need to make a small audio cut somewhere inconspicuous to get it to line up right with the video.
Have you posted this sequence somewhere? I’d like to see (hear) what you are talking about.