I think its a good plan. It may be a hard sell to the H but a solid plan. However, i warn you that he may not be worried about the kids. A lot of people feel kids will just bounce back from situations like this.

I would instead maybe focus on the money both of you save by living together and letting the children be the reason to support this.

M:33
W:32
Married 10/28/07
C: B13 G10 (Both from different relationships)
12/30/09 Bomb
Divorce Busted 2/04/10
5/15/12 Bomb 2