I don't post any more but I check your thread plus a couple of others every day. I have kept up with your sitch for years now (I hope you don't feel like I'm stalking you!).
RE the second phone/pager/ring tone issue. Ask him to make a special ring tone or two. One for you and one (or two for school/day care). I can tell you now that Dan will forget to keep a second phone charged, will forget to take it with him, etc etc, excuse, excuse and then you'll be back where you started. He might not get around to the second ring tone thing, but really, it's the simplest solution I can think of. Romeo (who is not stupid) has a good idea.
Purple
** Purple
As soon as you trust yourself you will know how to live. Goethe