My advice is to freeze the eggs.

You already stated you didn't have the money to set a second cage up. Then you go on to say you could put together a incubator and a rack for the multiple possible babies.

I know you mentioned the $450 cage you wanted but it cost much less to get a tub and set it up properly(see our sticky post on setting up a tub enclosure) to get the snakes housed separately.

When you "thought" the female was gravid, you didn't plan on what to do. Waiting until there is an issue makes everything an emergency.