OK, tell me what you think. I whipped this up in Audacity as a proof of concept. I had to chop up the vocals to get the pacing to match so I copied and pasted in bits of the undertone to smooth it out, but didn't do any audio finagling otherwise. I cut the TMP theme short because I didn't make any changes after that point...the test is for integrating the speech and TOS theme.

http://www.zizolfo.com/ff-trek-theme.mp3

The vocals are from the aforementioned audio book. The TOS theme is the season 2 version from a 3 disc set of TOS episode soundtracks and the TMP theme is obviously from that film.