More details on Zach Cregger’s DCU pitch HENCHMEN
>HENCHMEN would center on a low-level henchman in the Gotham crime world who gains notoriety after managing to incapacitate Batman through a stroke of luck, attracting the unwanted attention of the Joker and Harley Quinn. The Dark Knight would only appear briefly in the movie. The pitch bears strong similarities to "The Man Who Killed Batman", a fan-favorite episode from the 1992 animated series. Cregger has not yet pitched it to DC Studios, though the company is said to be aware of his interest.
https://gizmodo.com/zach-cregger-dc-movie-batman-henchman-james-gunn-2000640990
https://gizmodo.com/zach-cregger-dc-movie-batman-henchman-james-gunn-2000640990