Well i think you needt to bundle fatboy in to the deal
Give the power that be in North Korea that both their nuclear program and fatboy is the problem get rid of both and North Korea is welcome back into the world community
The “fake because” in Scott Adams words is in makes fatboy the problem that causes North Korea to be isolated. That that give the military in north Korea the cover to be the good guys to save the motherland
China can pull that off ... the Communists party in North Korea can see that China’s “capitalist/communist” is their path to prosperity. That North Korea’s current “Cult of dear leader Personality” stalinism on steroids is a dead end
A coup by the generals against Kim is probably not possible. It is the nature of a balls to the wall communist regime to do random executions among its leadership starting at just below the maximum leader. That keeps all of them not trusting each other. If one whispers to another a plan the other each has to consider that the other is trapping him or will rat on him and he will be shot. Where three men gather to plot two of them will be spies. That is why you don’t get coups in communist regimes.