[Western Crossover] This Bat's Heart Is Weary

What if Batman [Batfleck] from Justice League, after saving Superman and defeating Steppenwolf and the others, was killed at the end by the mortally wounded Steppenwolf? Batman thought he was dead, but when he woke up, he found... a different Superman.

[Story timeline: Injustice universe, main universe]

Injustice Superman and Injustice Batman, with Lord Batman and Lord Superman as the premise [but nothing comes of it]

Batfleck is just Bruce, Lord Batman is Lord Batman, and Injustice Batman is Injustice Batman. Lord Batman has unrequited feelings for Lord Superman, but this isn't shown.

Theme: I just want to teach two Supermen who don't cherish Batman a lesson