You've missed at least one.
James Doohan was in Relics
, and appeared with Shatner, Nimoy, and
Kelley in TOS and six movies.
David Warner (Chain of Command) appeared in Trek V and VI.
Robin Curtis (Gambit) appeared in Star Trek III & IV.
Judson Scott and Merritt Buttrick (Symbiosis) appeared in Star Trek II. (and III as well for Merritt.)
There's probably more, but that's all I have so far.