Probably a long shot anyway. On occasion you might get a guest star of a prior Star Trek production to be in a fan made film. But I doubt you'd get any of the main cast to participate. Part of that is they probably don't want to tick off the PTB's at Paramount. Paramount tolerates fan made productions as long as they don't profit by them and stay in their lane, but I don't think any of the main cast actors would chance it.