Tostada, it sounds like you have a really good L that cares enough to hope for your marriage to reconcile.
I hear the same thing from my W about the kids missing me when they are with her. It sounds like you and I are on the same page of doing all we can to make our kids lives the best possible. It does hurt to hear them express their desire to live as one family when there is nothing you can do in that regard.
As for your W having a change of heart, I think it is important that you dont try to sway her thinking. She most likely has her pride and does not want to feel controlled. All you can do is live your life now for yourself and the kids and hopefully she will come to her senses that her life is not going to be better outside the family bond. Just be friendly with every interaction you have with her even if she is being a jerk. December is still a long way off and you have started to see some small positive changes in her attitude. I am hoping the single life she is faced with now will sink in by the time the court date comes up.