Other Asian Countries that Could Have Pulled A Meiji?

I'd say that yeah, Korea is probally the best alternative. The trouble is Russia.

Well, no. Japan was the main issue. As I stated earlier, instead of attempting to pursue its own path, Korea was trying to balance Chinese, Japanese, and Russian interests, although it often favored one side over the others at certain points in time. Although Joseon had been a tributary of the Qing for centuries, the Opium Wars and further concessions greatly weakened China's grip over Korea, although until the 1890s, the Chinese did occasionally send troops due to Korean requests for intervention.

On the other hand, Japan began to install reforms starting in 1868, although some had been implemented earlier, soon after Perry forcibly opened up the state in 1854. Japan then created its own unequal treaty and imposed it on Korea in 1876, which theoretically attempted to detach the latter from China, but in reality began to gradually force Korea under Japan's influence. Several coups and uprisings soon followed due to political turmoil, most of which were disorganized, but the Donghak Peasant Revolution eventually led to the creation of the Gabo Reforms in 1894. Meanwhile, the First Sino-Japanese War broke out in the same year, causing China to effectively lose influence in Korea. In the following year, the queen was then brutally assassinated by Japanese agents, causing Gojong to temporarily seek refuge in the Russian legation in 1896.

Although the Gabo Reforms, which had been heavily influenced by Japanese reforms, were repealed while the monarch was in exile, and Korea began to favor Russia at the expense of other powers, public opinion, along with establishment of cordial relations between Russia and Japan, forced Gojong to return to the palace in 1897, and declare the Korean Empire in the same year. However, given Japan's actions and preparations up to that time, it was too little, too late. The Russo-Japanese War, which broke out in 1904, ended in a Japanese victory mostly because the Russians had underestimated the Japanese, was slow in transporting supplies and reinforcements from Europe, and a revolution broke out in 1905 due to social unrest. Although the Russians could have theoretically defeated the Japanese in a different situation, the combination of factors in the previous sentence ultimately left Japan with undisputed control over Korea, and ultimately Manchuria, until the end of WWII.

With an earlier PoD in which Japan almost certainly does not begin industrializing at the rate that it did in OTL, other European powers, such as Russia, could have either brought Korea under their control given specific incentives, such as warm-water ports for Russia, or could have led Korea to learn more about Europe in order to pursue more specific reforms with set goals. However, the reality is that Korea's actions had been heavily influenced by those of Japan beginning in 1876, and its temporarily favorable approaches to China and Russia had been due to aggressive actions from Japan. In other words, regardless of the extent of Japanese influence in an ATL, it's really hard to say exactly how Korea could have modernized given the political and social turmoil at the time.
 
Top