IMHO,

I would make a cooler incubator ASAP.

Even if they are normals you can still sell the babies and make enough back to cover most, if not all of the cost of the incubator.

If either of the parents are a morph, you would be a fool not to take the time and money to quickly build an incubator.

Sure you can do the maternal incubation thing... you can also kill all the babies if the temps and humidity aren't right.