Why has no one ever thought about a Gun-Kata Batman?
Put it in the universe where Batman fought the Predator. But instead of the Yautja and Bruce going at it, have the Yautja hand a few pistols to Batman and explain that the Ra's Al Guhl has been aware of the Yautja as he's lived centuries and butted heads with them. More to the fact, the true reason why the Yautja first visited Gotham is that they were aware a Xenomorph queen was left alive on Earth and wanted to check it out.
Ra's Al Guhl has it and he's been collecting Egg Sacs, to be distributed under the streets of Gotham. Convincing Scarecrow to make another Large scale gas attack that's happening high in several skyscrapers in Gotham and providing the funds to make it on a bigger scale than the Scarecrow can manage, Batman takes to the rooftops to deal with a bigger threat from Scarecrow than he'd ever known.
Only realizing far too late that the rash of missing Gothamites weren't cases of Scarecrow Gas unaccounted for, but Ra's Al Guhl's men dragging off the facehugged victims. Xenomorphs come in...
Fuck it, I really don't care. Gun-Kata Batman. get it done.