I'd like to echo this. Between Hurkan and Yumcax, together I've done them 9 times now and all I have to show from the actual fights are grips/capes/bullets/gorgets, none of which I actually need or really want. Thank goodness for the "Order Up" quest because I at least have something worthwhile to show for fighting these horrid creatures.
I think it'd be very wise to make the quest repeatable once every conquest tally. Who knows, perhaps it already is since we haven't made it yet to the next week lol, but it seems like it won't be. If it were repeatable though, there would be great incentives for going back and doing the old Naakuals too and the low drop rates on the nice equipment from the new Naakuals could be forgiven. Perhaps instead of losing the crests though they could just create a set of new Temp KIs you could get from the Naakuals.