What if Robert Pattinson was Batman in Flash?

Off topic I know.
How would that be ? Wouldn't it set up the new Batman in the DC. Movie would have been a better. ( I kinda like the movie not that bad unpopular opinion).

But why?

would be a bad decision because then it implies Ezra is the Flash in Battinson's universe and he just does not fit with the style Matt Reeves is going for