Excellent article!
Our problem is that Trump has no "skin in the game" There have never been any personal consequences to his actions.
The idea of having to kill someone to activate the codes would probably work with Trump. Given the way he fires individuals by proxy, I doubt he'd have the guts to kill someone with his own hands. This might even work with Kim Jong Un.
In the case of Putin, I think he'd readily kill someone without compunction. With him, I think you'd have to have him press a button that instantly erased all his billions stashed all over the world.