Romney might have done some form of all four, but he wouldn't have done any in the manner Trump is doing it. Romney is nowhere near as pompous, arrogant, and ignorant of policy as Trump is.
Romney was the governor of a very blue state .. thus he knows how to work with democrats .. AND, he would tread very lightly on repealing Obamacare because Obamacare IS Romneycare. Both born from the same conservative model from the Heritage Foundation.
Romney would not build Trump's wall .. would not be trying to ban all Muslims from entering the country .. would not insanely attack the press .. and would not attack the intelligence community .. and he would not have a racist sitting next to him in the Oval Office.
Romney would not be the most hated man on the planet as Trump is.
Romney would be far more effective than some lousy reality show / WWE 'celebrity.'