Yes, we have all of those (some are SE), and that’s where our scripts came from, by and large. The trick is that the audio quality is actually pretty bad on all of them, and I’ve concluded it’s not worth despecializing them. If you’re watching an audio-only version of Star Wars, a subpar soundtrack seems kinda insulting. Also, some of the voiceovers get stuff just plain wrong or are SE-specific, and I just can’t tolerate that.

My plan? Record an all-new voiceover track (essentially mono), which could then be placed over any track you like. Probably a nice top-quality Laserdisc-based stereo track, but could also be the mono mix or even a 5.1 mix.

EDIT: The discussion on this topic is here for some more history & details.