Nope. No interest in them - just the supplemental disc.
"Would it be possible to put the DE and Faces source video on top of eachother at 50% opacity to get technically double the resolution? Or am I confused?"
Ever hear the phrase "too much of a good thing"?
Besides, Faces is CLV until the last disc, and the Def. Col. is CAV throughout. You'd never get the frames to line up throughout the film. It would be like really bad de-interlacing.