I have read a post A LONG TIME AGO
about something similar.
Don't worry
Maggots only eat dead flesh or rotting things.
If they were in the egg odds are they were eating the bad whites or shrivled blood vessels.
And on the healthy eggs. No worries.
Healthy eggs means no dead tissue or food for maggots.
If they are in the egg that popped than they won't kill the embryo I'm guessing but Is still do my very best to get them out.
Try putting a peice of apple in there to draw the maggots remaining out of the eggs and maybe it will give the embryo a better chance.
Sorry I can't be more helpful but
Id still try to be positive and hope for the best.
Just remember that they eat death. Living tissue and what not is left unharmed.
But keep an eye on the egg whites and make sure that embryo doesn't dryout
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