You can get the eggs out and put them in a breeder box, I did that when I hatched the eggs from my sterbai cories at one point.
Make sure the eggs don't get exposed to air, you can use a shot glass to put into the tank and move htem into that under water.
The best breeder box thing to put the eggs in is one that's a fine net rather than plastic with holes. The holes are big enough that the fry will get out there once the eggs hatch almost certainly. A fine net has better waterflow anyway and your fry are safe in there for a bit.
Doing it this way isn't the best way but it works and it's fun to see the eggs hatch etc. The fry can stay in the net for a while actually you can feed them in there etc. I moved mine to a separate grow out tank once they were starting to change from wigglers to very small cories, can't remember now how long that took.
I raised around 10 fry to adult cories this way, out of probably 30 eggs or so, again not the most efficient or best way of doing it but worked ok for me and was quite fun.
ETA: This kind of breeder net thing is what I'm referring to: http://www.e-aquarium.com.au/images/...reeder_Net.JPG
The fry will want to hide so will squish themselves into the corners and edges, I thought they were going to get squashed but they were absolutely fine. I put some java moss and java fern in there too and fed them liquifry and powdered flake. No live cultures or food.
Also don't worry if the eggs this time get eaten, get things set up and the cories will breed again later.