They can be disembarked from a ship at the Port of Veracruz.
Plenty far South.
But no matter what we do, the Mexican "government" will immediately move them back to the border and push them to cross while agitating in the United States to keep them here.
And Invasion without an Invading force is not much good.
Veracruz? Why not deport the illegals aliens to Tierra del Fuego and make them walk back? I’d think this would be a huge deterrent to any future border violators!