Just to keep people updated, I have the Laserdisc tracks, but it will take me a while before I can do anything with them. My plans are to make them into true single-channel mono tracks (plays from the center speaker instead of the fronts on a surround system), sync them, and probably encode them all as DTS-MA lossless tracks with a 192k core, even though, to be honest, I don't think these soundtracks really benefit from being lossless. But why not, you know?

Then send the Japanese track off to a translator friend and make another subtitle track, and then... done!