Plausability check: Europeanized island of Kyushu during 16th century and beyond

Some time ago I was reading an interesting article about Nagasaki, Japan, which suffered a considerable influence from Western powers, mainly from Portugal. This made me have some thoughts on the possibility of turning the whole island of Kyushu (were Nagasaki is placed at) sort of an 'oversea department' of Portugal just as were, back in past, places like Brazil, Angola, Moçambique and other current-day independent territories.

How could we have an 'europeanized' Kyushu, strong and independent enough to defy/avert Sakoku? Would it ever be possible to have Portuguese nobility/royalty and local Japanese nobility to marry, in order to strengthen ties between them? How would develop the Portuguese overseas dominance of Eastern trading?
 
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I've actually wondered as to the possibility of eastern and western royals intermarrying. It might be possible if the Japanese on Kyushu converted en masse to Catholicism (which I think the Portuguese, or Spanish, tried in OTL?).

I won't comment as to outright conquest; there's nothing of any real value in Japan warranting turning any part of it into a colony. Maybe as a prestige gimmick or something.
 
I've actually wondered as to the possibility of eastern and western royals intermarrying. It might be possible if the Japanese on Kyushu converted en masse to Catholicism (which I think the Portuguese, or Spanish, tried in OTL?).

Yes, they indeed tried and had some success. All the conversion issue would not be a problem amongst nobility I guess, fter all, during the following centuries many European nobles converted from Catholicism to Lutheranism and vice-versa in order to marry. Okay, both religions branches of Christianity, still wouldn't be a problem if the conversion is from [insert non-Christian religion here] to Christianity. We would only have some problems if we had Christian nobles converting to Eastern religions.

I won't comment as to outright conquest; there's nothing of any real value in Japan warranting turning any part of it into a colony. Maybe as a prestige gimmick or something.

Not exactly a colony, but maybe a protectorate. Maybe a wealthy Kyushu wouldn't want to be bothered by a raging, secluded Imperial Japan right at its north, and would hire Portugal as their defensors maybe. In return, Portugal would use Kyushu as the headquarters for its eastern/asian sea exploration and trade.
 
At the moment I'm actually travelling in Kyushu visiting some old Christian sites.

Yeah, the catholic missionaries had a huge amount of success here. They were a little too successful really, they got a bit over confident and rulers started announcing that their people were now all Catholics- the shogun didn't like that.

I guess the problem is timing. The sengoku era had been going for a while before the Christians showed up, and though yes, their arrival was part of ending it, I have to wonder where things may have ended up if the missionaries had more of a disunited japan to work with.
 
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