One thing I always did when I worked at an LFS was get a big net, lift the rock they were on, slide the net underneath and pull the rock out the water so they fall into the net. I know not as practical in a reef tank but a thought.
As for hawks, I have no personal experience with them. I’ve always liked the Longnose Hawk but from what I’m reading is “small shrimp”. So perhaps they may be too big for your hawk right now?