It seems that ROTS opening is an extreme chalange to try to get rid of the music, and after tweaking around through multiple different software, I only got a result about the same (but without the dialogue gating issues of that video) as previous posted video. However many non-action places are easily isolated.

I did goof for hours around enough to discover: if one wants to remove the music from any of the action aequences, they'll need to use a spectral display to extract each peice of dialogue or necessary sfx and combine it with new sfx/foley along with the new music. The dialogue and some sfx can be perfectly extracted from the music but only through manual spectral masking, which I don't feel like doing. I have a limit to my strong work ethic towards all this, I'm not like Ady and his ridiculous rotoscoping.

Knowing this though, I don't doubt the fact that feature I highlighted above would work with Star Wars, so if a year or so wait is what is necessary so be it. It clearly just automates most of the spectral extraction process.