I love the idea of a reverse Spideypool, and I usually picture that situation with Assassin Spider and Zenpool, because they are already comic book versions that could be used in this scenario.
Zenpool is Wade with better self-esteem, more self-centered, he's not morally gray, he's a hero, he doesn't kill, he uses martial arts, that kind of thing.
Assassin Spider is when Peter gives up being a hero on a mission with Wolverine that went wrong, and he accidentally kills someone. He becomes morally grey and His attire has changed, because he is equipped to kill. He no longer has any contact with his civilian life; New York is no longer his neighborhood. To keep those he loves safe, he no longer exists in their lives.
So this headcanon would be a reverse Spideypool, where the usual Spideypool already happened. After they are no longer together, years pass, they meet again and realize that their positions have changed.
The troubled, anti-heroic man isn't Wade, it's Peter. The hero that the community looks up to and who gives them hope is no longer Peter, it's Wade.
And obviously it would make them both remember conversations they had, about Peter telling Wade that being like him is easy (especially since Peter always had anger issues and held back his punches), being like him is difficult, being a hero was something Peter constantly had to strive for. While Wade expressed his desire to leave that kind of life behind and be a hero, to be among the good guys.
Because in many ways they are similar, it's fundamental choices that make the normal Spideypool the way it is, and if some things had been done differently, the reverse could exist.
And since I love a good angst, I'd say they went years without speaking, without contact, because as far as I knew, Peter was dead. It took Peter a while to recover his and Wade's memories, and then he decided to go looking for him.
