Ghost shrimp do not need saltwater to hatch their eggs. I have a very tiny baby shrimp in my tank right now. My girls are constantly berried but I didn't have any hope of getting babies because of how tiny the larvae are. They get eaten, sucked into the filter, or starve. They take almost unseeable food at first. I think mine survived this stage because I added christmas moss. I have it growing in larges sheets on a tree base. Growing my underwater tree. I was also feeding the adult shrimp the left over Hakari Fist Bites I was feeding to my molly fry. It is very fine food and the shrimp come out in droves when I add it to the tank. I think that if you put an enclosed container in the main tank and put the berried shrimp in there, add some moss or something for the larvae to hide under from too much light. Even some loose filter floss would work, then feed them very finely crushed flake food or some liquid or powder fry food, you will get a few survivors. Everything I have read about breading them says it is starvation in the aquarium that usually kills them. Plus other fish eating them. I was actually planning on trying this but I run into some problems with my fish and tank so I haven't gotten the chance. Just google breading ghost shrimp and you should get lots of info. I found several sites with info on how to try and breed them.
Here is my tree the shrimp love. This is a picture from when I first added it. It has really grown since this was taken. The shrimp look like little monkeys crawling around in it.LOL