N.D.
It's not crazy. You all need closure and if this is the next step, then you definitely need to do the things that is going to help you get through this.
My ex (fiance) and I actually went out to dinner. It was kind of like a memorial/ way to end on a good note and try to build a friendship out of the "new" relationship (that is to say no relationship). You have children and I so would say that it's even more vital to try to maintain some sort of relationship. I think dinner would be a perfect way to try to come to an agreement on things.
Hope this helps. Good luck.
N.