I think a plan going forward is great. Written in pencil. Did you know relapse is a normal part of recovery? Replays doesn’t mean a person loses all they gain or has to turn into the same. It can but it doesn’t have to.
also, his recovery is his. You can’t plan it or decide what it will or won’t be. You can only decide what is ok for you.
your husband sounds way more caring then most. I don’t know, I’m not in your home. Use that to your advantage. He’s a good dad you said and involved so what an awesome place to be able to help support him on his path.