WI: No/Less Japanese Isolation

I'm doing research for my NaNoWriMo story and I was wondering. Is there any way Japan could have avoided or cut short its period of isolation? I suppose the Obvious one is avoid the Tokugawa shogunate. How would Japanese society be different, a stronger merchant class? the power of the lords and imperial court weakened? (unsurprisingly, it isn't my strong point)

Are there any timelines discussing this already?
 
while there aren't (as far as i can initially see) any TL's focusing on it, its been discussed a number of times

https://www.alternatehistory.com/discussion/showthread.php?t=241283
https://www.alternatehistory.com/discussion/showthread.php?t=278404
https://www.alternatehistory.com/discussion/showthread.php?t=271649

General opinion of what would happen is 'who knows' but it very much depends on who comes out of the warring states period on top of the pile ... if its Nobunaga (which would be relatively easy to fix) that sits in the chair when its over, its probably the most positive since the man was a genius both in Military and in Economical matters.
 
As I remember the Dialects where in the Missionaries propagated Christianity earlier are different from the Central Japanese dialects, that could also promote a strong regional culture or a separate nationalism for the people of Southern Japan...
 
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