This is the best pod, in 1700s have a Meiji like figure emerge in Japan and he leads a revoulution similiar to OTL Meiji restoration and westernized Japan 200 years earlier, Also at this time if Japan opened up massive trade with the Dutch, and Portugese they could then create a navy and Invade Ayutthya, Laos, Siam, etc before the French arrive, seizing these terriotories,'also With Advanced technology Japan destroys the koreans and seize Korea, them go after port arthul, etc where Russia has not yet expanded to, have a massive rebbelions occur in China which soon leads to Japan promising China help in return for Manchuria, so Manchuria falls to the Japanese, who then create a puppet gov, come 200 years later, Japn could integrate these colonies by 190
0 due to 200 year control..... Also due to them westernized when European powers come knocking they will not be able to sieze these colonies from a Japan that is modernized and their views will change come something similiar to WWI in otl Japan sides with the winning side, then it remains neutral in Th Otl WWII in this tl, although in order for this to work the butterfly net must be kept so the butterflies do not expand......