Actually I was thinking more along the lines of Clayface for Jon Hamm.
Better yet, they could bring in the Anti-Monitor and have Bale Batman team up with Batman of Earth 14 and Batman of Earth 65 to stop him. And then at the end, when all seems lost, all the Batmans of all the Earths will appear out of nowhere and bring him down. Infinite Batmans everywhere.
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