There might be a way to POSSIBLY get close to what you want. If the DVD audio track is a mono mix (ideally) and you can find a copy of the song, preferably the same source that you used for the original DVD, you might be able to copy it, mix the song to mono and then put it through a mixer or software program that is capable in INVERTING THE PHASE of the clip. If you then add this over the original DVD audio, the music should (in theory) cancel out and leave just the scream.
It’s a long shot and would involve all of the planets lining up just right, not to mention the music track, but it is possible…in theory.
Might get you close anyhow…
Tom