I’d go with the young Orson Welles as Batman. He was the Shadow on radio, he could pull off Batman.
Vicki Vale would be Rita Hayworth.
Alfred: Bela Lugosi.
The Joker: Conrad Veidt. I mean, hey, who else?
The Penguin: Peter Lorre.
Mister Freeze: A bald Boris Karloff.

Film would be called CITIZEN WAYNE.