I like a bunch of these ideas but some input for the Japanese:
- replace flaming arrows with Gatling guns and enable culverins.
This is a reference to the Last Samurai basically, also US intervention is a major cause for the end of the isolation era, leads to the Meiji restoration and westernization movement of Japan.
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Enable Carbine Cavalry instead of dragoons, for similar reasons as above.
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name the new army regular Goshinpei (Imperial Guard) Regular which was the first national army after the Boshin War. The riflemen could use a similar naming scheme.
Also, personally I think Meiji restoration should do few different things on top of ending isolation it should transform the consulate into a unique Capitol-like building with some unique techs:
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exchange all your export for an equal amount of resources (ie 3k export becomes 1k of each resource) villagers also no longer gather export at all, and get a proportional boost to the gather rates.
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an arsenal wagon and advanced arsenal techs unlocked (including CIR and other arsenal techs Japan doesnât have with dutch consulate + wonder age ups).
Also perhaps having the restoration add special cards to your deck which further boost your army, perhaps with a cost decrease. (Compulsory service). Additionally maybe a factory that can make heavy cannons.