It can be done. I was completely over my ex before I met my current, and we were totally cool having convos with each other as if we'd just been friends.
It helps to realize that the relationship wouldn't have worked out because of personality differences. There were no "what ifs" just, "Man if I knew then what I know now about myself..."
No. Just no.
If you offer that, then you will NEVER please her, because she will know she can even tell you to dump comic books and women's underwear if you're that desperate to stay with her. Everything's in her court.
Retain some of your dignity and just walk away.