I just love Jill Winger! She lives down south of us, between Chugwater and Cheyenne. We can see her place from the highway when we drive down that way, especially when she gets her hail deflectors over her garden!Though my dehydrator doesn't go as hot as hers, I basically do mine this way. I know I'll be freezing the dried eggs, and cooking them again in a very hot environment, so salmonella is not a concern for me-
https://www.backwoodshome.com/dehydrating-eggs-at-home/
This person goes over different ways to freeze them. I didn't read all of her pages but she goes over water glassing and other things pertaining to preserving eggs-
https://www.theprairiehomestead.com/2011/10/how-to-freeze-eggs.html

Not sure. I take however much broth I need for the recipe and add a couple tablespoons of cornstarch and see how thick it is. Then add some more, usually. I make it about as thick as gravy, knowing it'll thicken as it cools. I try to make it the day before I need it, otherwise I'll get into the recipe and realize I haven't made the soup ingredient yet, and get off track.