If Vietnam were so bold as to create a six month plan, I would not expect it to succeed. The revolutionary democracy you propose would most likely only take root in a country utterly devastated, like Iraq. Otherwise, the people would likely not support it.
The assumption has to be that while change is needed, there is a strong fear of chaos and violence. This is abhored by everyone, which creates a feeling of hesitation, of inertia, against change. For this reason, small steps as confidence building measures are far more likely to result in a peaceful evolution to democracy.
Openness and the absence of corruption would take many years to develop, even after democracy.
The people are ready for major changes such as happende in Korea. Those changes were really not fundamental to the society as the market culture was already flourishing in Korea as it is in VIet Nam now with its concommitant extensive freedoms though they are not explicit and still subject to the occasional crackdown.