The issue from my understanding is that new world civs collapse to barbs/indies. Because of how tech groups work with collapsing, if the Toltecs/Mayans get far enough up the tech tree, they'll leave behind indy cities full of crossbowmen, which are a nightmare for the Aztecs (human or especially AI) to conquer.*If* I understand, you want:
If so, the answer is Yes and here is how:
- Aztecs to collapse
- Former Aztec and/or all area cities to change ownership to Natives
Start in Map Mode. Select the tile of an Aztec city, this will take you to the Plot Data screen. In the upper left corner, you'll see Montezuma in the drop-down box. Expand the box and scroll to bottom of list; you'll see four Barbarian entries. Natives are the third entry (or second from bottom). Poof! City flips to natives. Repeat for all desired cities. Any civ collapses instantly once their last city has been flipped. Indy and Barb units can get expelled nearby so check the area and move or delete them.
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So they're asking if it's possible to force new world civs to collapse to natives instead, which forces them to be stuck with archer defenders and avoids the issue.