Again if they do Flashpoint Paradox, the focus will be on Flash and his mother and Oliver and Robert. Joker and world war stories will probably be gone but those are mostly ancillary. You could replace Merlyn's earthquake machine for city destruction.
Can you imagine Robert giving Oliver a letter saying he's proud of him for surviving and saving the city? The feels would be so good.
And it'd be fucking spectacular for Moira to take Martha Wayne's place in that story. The actress would kill that material.