This may be a long shot, but if you have a bit of dialogue with only the score underneath is... I wonder if it would be possible to filter it out by using the score CD as the "noise profile" and making sure it's synched with the Princess audio mix. Instead of filtering out noise, you're filtering out the music.

Basically, you'd edit the music back to match what's in the clip of dialogue you want to use and set is as the noise profile. Maybe when you apply noise reduction using that as the noise profile, it'll filter out the music.