I see no way that would happen. You mean Fat Boy tells his generals -- ahh never mind -- forget all that stuff we've been talking about for decades? NK is fully invested in this farce and would go out in a blaze of glory.
Their response would be rather passive not active. They would not go out and say their policy should stop. They all sing in chorus to vow the fight to the death until everything explodes around them and they have absolutely no means to fight back. I noticed a curious pattern of passive resistance in N. Korean's attitude toward their regime. It suggests that they want to be left alone. They are not active participants. Even elites vaguely feel that they are at the dead end, but somehow find no alternative to status quo.
I do not discount the fact that they were brainwashed, but they also know that they have no chance, and Kim Jong-un is not an endearing leader. He is less than what Hirohito was to Japanese during WWII. Their brainwashed mentality would cause problems after the shooting subsides and a new regime or occupation begins.