If a fallen chrysalis still has a post, I take a piece of sewing thread about 6-8 inches long and make a double knot around the loose end of the post (the post or stem is called a "cremaster") and then tie it around a stick or the top netting in my raising cage so that it can hang freely. If it is not hanging freely when the butterfly hatches out, the butterfly cannot emerge or pump up it's wings correctly, and is often deformed.
My suggestion on the one without a cremaster is to make a large knot in a piece of thread and use a tiny drop of superglue to attach the string near where the original post was, then tie it as mentioned above . Sometimes it will work but it is much more likely to have trouble getting out of pupea and there is greater chance of deformity when the crysalis has been damaged.
Good luck & let us know how it goes for you.
thought you might find this link interesting: www.hilozoo.com/animals/AI_monarch3.htm