TT,
The things that you are changing about yourself are for you and Im glad that you know that. It is the only way the changes "stick". Paving the way or sowing seeds, well, it comes from making the changes in you, if that makes sense.
Once I had found a way to work on the things that I didnt like (like my extreme OCD), I became calmer, gentler. I was able to see the mistakes and problems I caused in my marriage. I use to say all the time " its tough being me" and I meant it.
Just be you. When he sees you it has to make him feel good. Dont be fake, he wont trust the changes. Until he sees that this is who you are now, he wont believe them. He will test you. I tell myself all the time when h does try to bait me, " I'm a duck, Im a duck" it makes me laugh and I just walk away.
One thing that I can say to you, is dont wait for him to make a move. You are sitting yourself up for dissapointment. Be the best mom and you, be his friend. Treat him as you would want him to treat you, even if he doesnt.
Not putting pressure or demands on him right now is the best way for paving the way. I think of it like this, if after the changes that I made he still wants to walk away, I'll be OK because out of this I have become a better me, and it wont be me who takes any unresolved issues from my past to my future. That my friend was and is my goal.
Just be you, the better version of you. He will notice, sooner or later.
FH