Greatly change the meta, civilization charactristics and mechanics, especially the Spanish, just to introduce a small historical symbol. What I see you are going to do is change just for the sake of change.
You think the arquebus is a common thing. Sure. You can just simply change the name of the Chinese and European Royal ones so it would not be unique to any single faction. Definitely better tham changing a lots.
Basically not. To take the most obvious example, you ignore the artillery. For the Qing Dynasty, it was the main firearm, but not the only one. The earlier the age, the more diverse the types, such as the three-eyed gun. Not to mention, the Divine Machine Battalion of the Qing Dynasty was no longer a military organization specialized in firearms, but a royal guard corps. Its connection with the image of gunpowder was mainly in the Ming Dynasty
Anyway, the Divine Machine Battalion (Ming) was a privileged military organization that produced and used all kind of gunpowder weapon for the dynasty. Organization shouldn’t be the name of a unit, as I explained to you when discussing Asian Outlaws. Do you remember? To use a few perhaps inappropriate but expressive examples, a unit should be called jihadists or terrorists instead of Taliban or ISIS, and a unit should be called Republicans or Democrats instead of Republican Party or Democratic Party.
Divine Machine Battalion can be a technology or card related to gunpowder units, or a banner army dominated by gunpowder units, but should not be the name of a unit. If you want a name for the unit, the word “鳥銃”(literally “Bird Gun”) is a very suitable and common Chinese term to generalized refer the arquebuses and muskets used in Chinese history, which is why I suggest it so.
Ideally, AoE3 can maintain its peak, 20k active players.
Ideally, wars should only happen in games and no longer in the real world.
This is the opposite of what you’ve been doing all along.
You always want AoE3 to have new civs and factions to those small kimdoms, but here you even said that by introducing just one or two representatives of their culture to make a minor civ or mercenary units representing them is “having an excessive number of unique unit”.
Since they’re not European, of course they don’t share the same units, and that’s one of the big draws of AoE3, the richness of culture. If any civs, minor civs or mercenaries other than Chinese have Jingals, the units will have different appearances, names, and stats even if they have similar positioning. For example, the Chinese one would have the Qing sodier’s suit in the appearance and be named “Taiqiang” or “Nine-headed Bird Gun”, respectively the pinyin of its Chinese name “抬槍” and the literal translation of its another name “九頭鳥銃”. And the other one may be named Jingal, Gingall, Wall Gun or any suitable term in their language.