Is this anything like what you were looking for? These are ones I've seen floating around for awhile now. Also here are some more via search.
That's season 1 and 2. But thanks to your search, I found this video, which are season 3 videos and should be what the original poster was looking for. Neil
There it is! Thanks! I saw this once on it's original YouTube channel, but it got shut down and I could never find it again. Now I just need to hunt down that original Star Trek: The Motion Picture featurette that had Persis Khambatta getting her head shaved. That one has been taken down for a long while.
Kamdan - the Making of TMP featurette is now re-uploaded. Persis is shaved in part 2. Part 1:https://www.youtube.com/watch?v=xRmJYuBRe4o Part 2:https://www.youtube.com/watch?v=kXEFsk4cIEg