I researched a little to figure out what they are on about, and there seem to be three main options, depending on how much of a semblance of a democracy they want to keep up.
The simplest yet weakest way is what you described: A shadow president. Worked for Putin, why should it not work for Trump. The downside: If the puppet president develops a mind of his own, things can turn ugly(er).
The next option is to have Trump become vice presidet (the presidential term limit doesn’t seem to apply to VP), then have the president resign and make Trump president instead, claiming that the 22nd only limits being elected twice, which might be ok with the letter of the law, but only an idiot or a tyrant would interpret it that way.
The third option would be to have the president use the appointment clause, which is very vague about to what exact offices the president can appoint someone. It doesn’t explicitly state that the president can’t appoint someone else to the office of president. But again, only an idiot or a tyrant would interpret it that way.
I’m considering getting a Switch 1 now. I can find hackable ones for €100 in my area.
But then again, it doesn’t really do anything I can’t do with my other devices.