If Trump loses, there's one easy way to stop him from inciting a coup.
They could do what the Portuguese did to
Prime Minister António de Oliveira Salazar, who was replaced as dictator after he suffered a cerebral haemorrage and lapsed into a coma in 1968. As he was clearly about to die, a new leader, Marcelo Caetano, was appointed by President Américo Tomás.
A month later, Salazar unexpectedly recovered his lucidity, and nobody dared to tell him that he had been replaced as leader during his illness, so for the next two years, until his death in July 1970, he was allowed to "rule" the country, with his aides having him sign decrees, treaties and laws, despite the whole thing being a charade, with the actual country being ruled by his successor.
Hollywood must have any number of sets that exactly replicate the Oval Office; Stick Trump in one and let him sign Executive Orders, veto laws, and eat Big Macs, and he will likely never know he isn't the actual President.