I don't know why this is even a question. It's Sam Neill...
And just because the current crop of idiots at DC have turned Lord into something he was never intended to be ... a villain ... doesn't mean he has to be that in the movie. They can very easily make him into the rich benefactor/director of the League. I would think Neill could absolutely nail that. Lord was never unlikable and was always a very sharp negotiator. Sam could nail that, too.
Max Lord ... a villain ... Not in my world. ... (oh, when will we be free of Dan Didio!)