We’ll never see Zero or any other former president in handcuffs. It just isn’t done that way in the USA. The most we can hope for is to see him forced to step down.
Yet, but the century is still young.
There has also never been an ineligible person occupying the office of President. If there is, and it's well proven and publicized, who knows what would happen?
Every officer of the United States, and not just the military ones, as well as military enlisted members are after all sworn to support and defend the Constitution, against all enemies, foreign and domestic. I think an ineligible person exercising the powers of the office of President would fit the definition of domestic (or would that be foreign? I guess it depends on whether the person is at least a citizen, perhaps later naturalized, or not)