Blake's story is what I was thinking about for something like this. Besides, that is something we all would like to see, right? Blake-as-Batman? Maybe the story would be of, and this is a pitch of mine: Time after TDKR; Gordon is still commissioner, and Alfred is in charge of Wayne Manor's Thomas and Martha Wayne Orphanage with Blake. He has trained in basic fighting, with acrabatics, but is not Batman; instead, he uses the Batcave to monitor whatever crime is in progress and help the GPD like a guardian angel. But things escalate when a new enemy appears, lets say Penguin(?) and the guardian angel bit doesn't seem to work anymore, and Blake has to become something else, and that "somethign else" is something Blake doesn't feel right for. And even Alfred by his side, is reluctant because of what hardships Bruce Wayne dealed with when he was Batman. But with no other options available; Blaek must become the new Batman. Bruce Wayne was Batman; a Dark Knight, and it worked. Will it work again or will it spell doom for Robin John Blake as Batman; the Caped Crusader?
DARK KNIGHT SAGA: THE CAPED CRUSADER
At least, that would be my idea. I can imagine someone would come up with something better.