What if Flashpoint will be Batman-centered, as someone suggested. Instead of the CW's Superman-centered Crisis.
I have one basic question regarding the Keaton appearance. How could even Flash blend in with the Burtonverse world and its gothic feel. Will Flash seem out of place there? World's fatest man visiting Burtonverse, will be a fish out of water on many levels. He will be a GOD there, more so than in other universes where there's other people with powers.
Then we come to Burtonverse suit. With the sculpted design, long pointy ears and yellow logo.... I know it works well within his universe, but would it even function if he enters another universe? How can he fight in universes where criminals are more ruthless and don't wait for him to fight one at a time.
Back to the Batman-centered idea. I can't drop the idea of having 66-verse included. It would be more fun to see than Batfleck, or Pattinson as well.
DCU is already included because that's where Flash is from. DCU is the base here.
Nolanverse has other characters to include. Murphy or Neeson might transfer most easily to the Burtonverse's nightmarish feel. So we don't need Bale back.
I can imagine that 66-verse Batman is already dead. Let's say it's about 20 years later there, as it is 30 years later in Burtonverse.
However, it would be respectively 1986 and 2022 then. Doesn't work? Well, Flashpoint is about time travelling after all.
And we can even tie it to WW84 here. Something in that film could open up a possibility that two years later, 66-verse is in danger.
The Bat-element from 66-verse can be Robin. An older one, as pointed out.
IF that Robin is to do some action, we have to re-do the suit.
Titans live action sort of upgraded the classic comic book Robin suit and made it believable in a modern world's setting. But it was a bit bulky, because it was done for its own universe.
Here's are suggestions for a better upgraded version of the 66s suit if it should be worn in 1-2 action scenes. At least color-wise.
I prefer the first one in line. But it lacks the classic shoes.
Here's what it could look in live action. Note that this is the BvS suit.
As it's not that bulky, the upgraded 66s suit can be almost identical but with actual green, red and yellow. Because it should BE the 66s suit, albeit a much upgraded one.
Regarding the actor. Here's what Robin looked in 1966
This is Kevin Zegers in 1998 or 1999
Isn't there some similarities? I think so.
Go forward in time about 20 years, and it's not far-fetched that Kevin Zegers by now can play the 66-verse Dick Grayson in the year 1986. You don't have to like the actor, or 66-verse included generally. I just suggest it can work. Casting is only a part of it.