Honestly, in some respects you've gathered up most of what is probably known at this point. Anderson and I put together a pretty comprehensive Hawkfish Breeding overview back at MOFIB -
http://www.marinebreeder.org/phpbb/...214&t=4320 It seems to me that many people TRY to breed hawkfish but never seem to get beyond pairing. I.e. they'll get a pair going and then one dies, or jumps (um...pelagic spawning fish do that). Or they kill each other. Or disease gets in the way. There are certainly people I know who have Hawkfish pairs and they "think" they're spawning. I think Sanjay's Longnosed are spawning, and I think they got some video of courtship but not the actual spawn.
I think it's safe to say that if it hasn't happened already, someone will get Hawkfish spawning documented in the next year or so. Too many people like them, and too many people are starting to realize that they can establish or even just buy pairs (you can even find compatible pairs of Hawkfish through the Foster's & Smith Diver's Den occasionally - ideal if you don't want to futz around with trying to pair them yourself).
Beyond getting the spawn, it's fair to assume that they'll likely be a difficult rear. Whether they'll work with rotifers or not will remain to be seen. The next decade is going to bring us better advancements in culturing pelagic larvae. I've seen enough evidence, mostly more recently provided by Matt Wittenrich, that rearing environments can play a huge role in the success or failure of feeding fish larvae. It may be that a certain fish that we thought "cannot" be done with rotifers and greenwater in fact COULD be done...and the answer may lie in the rearing environment provided.