You came up with an excellent solution! I have used the crate solution myself. Hopefully, the mother cats will not become to stressed out at being confined. I add a warmed cornmeal sock (just like a rice sock but a bit softer) alongside the babies in case mama kitty does not immediately snuggle up to them.I just wanted to say that the mother cat I spoke about above just had no idea what she was supposed to do with them. She just kept stashing them then lounging in the floor like they did not exist.