Newt being a crack shot, sniper, or excellent knife/machete fighter.

Or alternatively, Newt driving a car/tank or flying a helicopter or something like a boss.

Just a situation where magic isn't an option and Newt saving everyone's asses with one of the above.

Or if you want to make it a modern AU, Newt hacking into something to delete evidence of magic or something.

I just want BAMF!Newt with muggle related skills and saving everyone with it, when everyone's all "Oh shit, this isn't something we can use magic to resolve, what do we do???" lol