[Immersion] Option to carry forward culture appearance into next era

Starting in Era I as the Zhou and then adopting the Celts, then the Aztecs, can be a fine choice mechanically, and this plays into the "alternate history" take of Humankind, but when we'd like a bit more immersion when we play, it would be nice to gain the Celts' benefits without gaining their appearance.

So, when I adopt a new culture for the next era, I'd like a checkbox/radio button that allows me to retain my culture's general appearance (e.g., "East Asia", "Western Europe") when it comes to the appearance of my armies/buildings/avatar to maintain cultural consistency.  My culture's name might remain the same as the old one, or let me type out a new one.

E.g., as the Zhou, I choose to retain my cultural appearance when I become the Celts.  I gain the Celtic affinity, LT, EQ and EU, but my cities and armies look East Asian, my avatar wears the same clothing as the Zhou, and my culture is either named Zhou, or I'm all allowed to type in a new value ("Qin" or "Jin").

I recognize the Nemeton and Gaesati may look out of place because it would be too much work for your art team to make "cultural counterparts" of every EQ and EU.