He will find his way, his way. I see nothing wrong in what he said to you about knowing what to do to help himself. If he was given the tools then he knows how to use them...the issue only becomes if he will use them, or not. He can just as easily get well, as he can relapse. Either way there will be always be something to learn.
And if your husband is apprehensive...
And you are worrying about rocking the boat in that area...
Know that he doesn't have to come stay with you. There is nothing that says you have to take him in. And he is more than capable of working out a place to stay.
Also with the poetry. You are not going to be able to get into his head and truly understand what he is thinking, feeling. I write in this medium all the time. My whole journal is poem after poem...I use the abstract very well. I only let the true meaning of a piece show if I want it too, the more personal ones I wrote for me, they make sense to me and I don't take the reader into consideration because this is for me, not anyone else. My way of working my head out, life out.