The devs should add a historical start for the beginning of the Aztec Invasion in Sunset Invasion, preferably a year before they arrive.
Suggestion: Add Historical Start for Sunset Invasion
- Thread starter MrPiggles
- Start date
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It wouldn't really be a historical start though to be fair. I see your point though for those wanting to jump straight into the DLC and try it out.
You can just start 1250, and wait a couple months. You don't need a bookmark for that? And if you need a bookmark, they are in common/bookmarks.txt. Just write one. 
As long as the bookmark only appears when the DLC is loaded, I see no reason to add a special "alternate history" start.
A start after the Aztecs have a foothold could be interesting, but is also FAIRLY easy to mod. I could tool around a bit, but since I am slow on this sort of thing, and paradox honestly isn't likely to add it...try the mod forum?
The main problem with selecting a year like 1250 is there's no guarantee when they're gonna arrive, it could be 2 months or 20 years. Pdox should add a special Sunset Invasion only start where the Aztecs have already or are guaranteed to arrive within the next year or two.