Well if I go through with my idea of making Constantine, I would be glad to interact with you guys... Just so long as you're cool with living the rest of your lives with bleeding ears and visible herpes all over your bodies. XD
My main problem there though is coming up with a reason that John would be in Gotham, and what would be keeping him there. Eh, either way. Still thinking hard on it.
Could be investigating a demonic cult taking root in Gotham. (You know, to foreshadow one of the things coming up after the Owls and their Talons.)