That's great! ... whenever you can.
Like with Star Wars' laserdisc / DVD bonus disc -- if that Criterion CAV laserdisc source was used for one or both of the non-restored DVDs, then that might be a better and more convenient place to start such a project.
The '99 Warner DVD heralds the audio (nothing for video) under "special features": SOUNDTRACK REMASTERED IN DOLBY DIGITAL 5.1.