Yeah I dont think any Triggers can be trusted with shrimps so in that case the Hawkfish should be fine as long as you have a lid on the tank as I've know them to jump.

Hmm just been reading up more on the Raccoon Butterfly and they dont get on too well with Triggers which I was unaware of. So looks like thats out the window. Could try a Copperband Butterfly, they can sometimes be hard to get feeding and may nip at corals but one the otherhand some are the opposite and never touch a think and will eat artemia no bother.