It's hard as fukk to pull off. Really, every live action batman we've ever seen, has been somewhat grounded. And extremely grounded if we're comparing what he does in comics/cartoons. He's a normal ass human brehs. Battling gods and shyt. And beating them all. As long as he has enough time to think about how. And you have to sell that to audiences not only with the plot,. but with the visuals.
That's why even in his most recent film, with all the latest tech, they had to have him struggle to beat one jobber. It's much easier to have him fight other street level characters. That's why his most known adversaries are street level dudes
If Gunn pulls off a comic cannon Batman in live action, he'd be the first and the best