I did a thread that featured alternate solutions, but nobody responded to it.
I thought you were completely wrong on both the notion that the US is pursuing a one Korea policy, and that this is the obstacle to peace. However, I didn't think it was really worth arguing about so I didn't respond to your thread when you started it.
It is true that we think a peaceful reunification of North and South Korea would be a nice outcome. I suspect most of the rest of the world would think it a nice outcome as well.
But the United States is hardly actively pursuing such an outcome.
US policy is to not allow South Korea to be violently conquered.