Looks promising! Interesting that you are using a Trill in the TOS Movie era. Are they Federation members yet, or a new, outside species? Even in TNG, the crew had none, and they did not seem very familiar with 'joined' species.
Looking forward to the film!
Actually, there's support for the inclusion of Trills in Classic Trek
. During DS9's "Trials and Tribble-ations," Dax tells Sisko on the bridge of the Enterprise
that she had met Doctor McCoy in one of her earlier incarnations and thought he had the hands of a surgeon.