Well, it helps that they are cleaner shrimp. Just a guess, but there's a possibility that the trigger will accept it as a purposeful shrimp in the tank and leave it be. Then again, it could be a matter of time before the trigger grows to a size where the cleaner shrimp serves a higher purpose as a meal than a cleaner.
Me personally, I'm a fish guy and everything else is not heartbreaking if it is lost due to a favorite fish. I have polyps that are still sacrificed every now again by a curious Majestic Angel. If it were me, I'd get the trigger. They are a lot of fun to have and that is good one for a community in general.
where's me money