Not all the Nimoy host segments were aired. Nimoy's were taped first, and were SUPPOSED to air first, but Sci-Fi ended up pulling a switcheroo and starting off with Shatner's instead. (Maybe Shatner had a better agent?) When they were two-thirds of the way into the Nimoy versions, the new programming manager Bonnie Hammer initiated a change of direction at the network (the "SciFi 2.0"/"I am SciFi" era), and the Star Trek SEs were abruptly taken off the schedule.
Transcripts of the unaired Nimoy host segments subsequently surfaced on Sci-Fi's Dominion message board (which no longer exists), and were mirrored on a Nimoy fansite (which also no longer exists). Fortunately, through the power of Internet Archive, I salvaged the transcripts and put them into a text file. They could make an interesting bonus for this project.