Ha, thanks! I gotta admit, I don't think I've ever put so much effort into making sure I got a character's butt just right.
The first thing that popped into my head is "Bruce dies, and with no one else capable of taking over, Dick steps into the role. But not as Batman, as Nightwing. And he has to wrest back control of Gotham." But everything handled in a pulp noir flavor, with all the usual fun troupes (the femme fatale, etc) that're associated with it. Roxy Rocket would most definitely be involved.
My second thought was Dick being a stowaway on a Gordanian slave ship, and he has to defeat the alien slavers, free the slaves, keep them from killing each other, and find his way home. Not quite a fish out of water thing, but more of a "dark Silver Age" vibe....kinda sorta along a similar vibe to certain arcs in Invincible (gods I miss that book!)