A serious problem for Trump's plan is that Biden is running again and he will be in power.
If Slow Joe runs again, it can only help Trump. May not even need a coup, given that CNN et al keep finding new ways to give him free advertising.
Democrats should get off their asses and nominate someone with a pulse but I doubt that will happen, so they'll probably go full QAnon and start accusing Trump of fraud if he wins.
I mean, it sure as hell didn't help him the first time, so why would it this time around
The thing is, incumbent president's always win second terms in times of crisis. The current war between Ukraine and Russia might not last long enough for the next USA election, but the cold war it started will be the closest to a crisis in years, and that will only help Biden. Not to mention Trumps praising of Putin, I doubt that can go well for him...