I can speak to the crazy fucking fever dream that would have been Justice League: Mortal by George Miller.
While Justice League: Mortal did not end up getting made, the character of Lord did make his cinematic debut in 2020’s Wonder Woman 1984, played by Pedro Pascal.
Sounds like Miller was not messing around when it came to making Justice League: Mortal.
The film had already lined up an ambitious cast, which included Jay Baruchel in the role of the villain Maxwell Lord.