You could get away with a Choc Chip Star. I've had one and I've seen several other people with them.
The trick I found it to keep your trigger full. I full trigger is a happy trigger.
My Choc Chip was in with a clown trigger (6" or so) & Emperor angel (10" or so). If you don't keep their belly full, they'll nip at anything. I also kept about a two dozen big hermit crabs in the tank as well. The only problem with the crabs was the clown would eat their long antenna...so all crabs had really short ones
They were in the tank for over 2 years together. Had to break down the tank to move