Blackstone
Brigadier
We're pretty close on our thoughts on Finlandization of a united Korea. Where we might differ is I see substantial similarities between Imperial China's tributary system and how a "Finlandized" Korea would act. I say that because the PRC carries forward Imperial China's pragmatism with foreign people's governance of themselves, namely it doesn't care how foreigners rule themselves as long as they're good for business and they don't tread on important Chinese interests. A united and Finlandized Korea would pretty much have to behave thus.Vis a vis Finland, it meant that the Soviet Union had effective suzerainty over Finland, which was still sovereign, but had to consult Soviet leadership on foreign policy decisions. Vis a vis China and South Korea, it does imply that a united Korea would be as much in the Chinese camp as say, Belarus is in the Russian camp, but the specific details are more sketchy.
Do remember that talk about tribute to the Chinese is ahistorical nonsense. In most cases, the tribute trade was profitable for the tributary nation in that in return for acknowledging Chinese supremacy, the tributary was bribed off with more expensive return gifts. The actuality of the Chinese tributary system was closer to the Chinese bribing neighbors to indulge their delusions of grandeur than military extortion.
In truth, the Chinese tribute system is a misnomer and is better replaced with something less propagandistic.
The Chinese tributary system isn't a misnomer, but it is as you described. I say it's not a misnomer because the term is a workable description of Imperial China's policy on how they dealt with foreigners and how foreigners could deal with China. You clearly dislike the term, but I suspect it's mainly personal pique. Nevertheless, do you have an alternative acceptable to most of the world? The follow up question is do you have the power, resource, and influence to impose your alternative? Do you even have the will to do it?