Batman would play dirty by getting his mate, Commissioner Gordon to investigate Superman's undocumented immigrant status. Failing to produce a birth certificate results in Superman being taken down to the border and dumped on the Mexican side.
Superman, being a law abiding sort, accepts his fate and begins a new life bringing down the drug cartels.
"Look up there. Is it a bird? Is it a plane? Ay caramba! It's Supergringo."
I can feel a pitch to Netflix coming on.