Over the years there have been preservations of the tracks here and elsewhere. Some bit perfect and some not, but i don’t have them.
Wish they were on the 4K releases. The stereo mixes were left off.
And i also wonder how faithful the 7.1 audio is to the original 6 track mixes.
Its the reason i haven’t retired my laserdiscs and i dread when my player breaks.
Everything but VI is theatrical on laserdisc except for the tv extended star trek 1.
Treks 1-5 are very good digital LPCM.
For 6 one can simply just create a fan edit where the extra scenes are edited out because all that one did was just add scenes, no actual alternate takes were used like the 2003 version