Nicolas Cage revealed that he would be open to playing The Spectre in a DC Universe film.

"Ohh! Yeah! Jim Corrigan, the Spectre (old DC comic character). That would be a fun one," said Cage. "But that’s a hard one to pull off because he’s virtually invincible, he has no weakness. You need characters that have a kryptonite, that have a flaw, but he’s kinda unbeatable. But that would be a fun one."

https://www.cbr.com/nicolas-cage-the-spectre-dcu/