Re: BvS villain poll
It's probably unrealistic, but since it looks like both Bats and Lex need an intro, I'd use the Slade Wilson from "Arrow" to add a physical threat to build up Batman, include the "Arrow" series into the universe and bring in a character that requires less screen time. His backstory can be abbreviated rather than as fleshed as the others should be.
"They laughed when I said that a man could walk on the moon. Now I'm up here laughing at them." - Louie Armstrong