Sadly, I've had to do this too. As horrific as it sounds, I'd say it's no more terrible than freezing and flushing them. I fed a batch or two H. reidi fry to my 110g back in the day. Koran angel and Maroon clown cleaned them up pretty quickly.
If the H. erectus ever have fry, I will consider the task but.....there's no way in hades that it is do-able until the house is more in order.
Hey Gemmy I have a question: is that Anthellia I see in your tank? On a clam shell??