As Al mentioned, there are a few fish that would work for you.
My number one pick in the "small mouth" category would be a cockatoo waspfish (Ablabys taenianotus). Any of the other waspfish would also be fine, the redfin (Paracentropogon rubripinis) being the most cloroful, generally speaking.
Lion-wise, the fu manchu (Dendrochirus biocellatus) would be a good choice (they have small mouths), altho some can be a bit difficult to wean (once weaned, they're little food beasts tho). A smaller fuzzy (D. brachypterus) would work (again, as Al suggested), and depending on how large your clowns get, may work indefinitely, esp. if the fish "grows up" with the clowns.
Small species scorps, such as Scorpaenodes caribbaeus, S. littoralis, Sebastapistes strongia, or leaf fish (Taenianotus triacanthus) would also be great. However, leaf fish can be difficult to wean onto non-living foods, but fortunately, are easily trained to take live food from a small net...seriously, they actually trip all over themselves to get to the net!
For feeding/weaning, I strongly recommend DIY-ing a "stealth stick"...it's really the best feeding tool we've used (Renee and I actually hold a patent on it).
FWIW, the fish in the most danger would be your dottyback by virtue of its shape (rather torpedo-ish).
HTH