What If There Were Two Bruces? [Mainly DC]

A story about two Bruces.

They heal each other, and maybe even fall in love in the end (not really).

Well... it's an angst story, but a little warm, too.

A Bruce from another world, accidentally driven to lose everyone by that world's Luthor and left unable to trust himself, failed to save his family, Gotham, the League, or the world after he was replaced.

Superman from another world, full of remorse, pulls him out of a time-space rift, only to discover that this Batman is on the verge of becoming the Batman Who Laughs.

Can a Batman who doubts himself be healed by another Batman? Can the Batfamily's hard-to-express love find a way around their emotional wounds?

Can the tragedy that began with Batman finally end with Batman?

(This is going to be very angsty for my original Bruce, but I just want to write about a Bruce who's suffering through a complete mental breakdown, yet still desperately tries not to worry anyone. I think it'll be very sweet.)