You'd have the same problems as when you try to save a clutch of eggs that had to be surgically removed from the mother anyway. Since those eggs wouldn't go through the mother's shell gland and cloaca shortly before being laid, they would not get any of her antibodies or beneficial bacteria the way eggs laid naturally do.
Most of those surgically harvested eggs prove to be infertile. Those that hatch often produce snakes with horribly weak immune systems and digestive problems.
The Zombie Mama is here!