You won't be able to generate that much national culture to cause math issues (it was fixed long time ago, but text issue was fixed recently), as each city is capped to +210 000 culture per turn.
If you had 1000 cities, then it would be only 210 million culture per turn. Playing 1000 turns with that would be measly 210 000 million national culture.
Actual limit is 18 446 744 073 710 million national culture (or half that if signed variable).
This global only changes how many levels you can reach within given level of national culture.
So currently its 10 -> 100 -> 1000 (1000%)
If you halved global, then it would be 10 -> 50 -> 250 -> 1250 (500%)
If you divided it by 10, then it would be 10 -> 20 -> 40 (100%)
Who said I was talking about achieving it via normal gameplay (for testing purposes), lol?
Cheat Engine exists for a reason, ya know.
But I was also speaking about adjusting the actual in-game curve to allow for reasonably achievable multiple LVL3 traits.
As in, not just a couple of them, but a LOT of them - or, at best, ALL of them.
These are two separate "testing experiments", though - one as a "real progress" gameplay, another as a "buffed leader" gameplay.
The latter just requires being able to mathematically fit ALL the traits into ONE player - and increasing my culture via CE to "grab" all those traits at once.
The former rather means a culture curve that would allow for most-but-not-quite-all traits to be realistically achievable through actual gameplay and at LVL3 as well.
Thus, the curve itself would be quite different between the two goals.
The "grab all" curve could start small and then quickly grow big, while the "play all" curve would start bigger but keep much lower increases between traits.
Basically, the difference between "1-10-100-1000" and "200-210-220-230", more or less.
Additionally, the latter doesn't need to reach into the highest available numbers to begin with.
That said, I just realized, the second method could also include the first, but not vice versa.
Anyways, that's just for me to mess with, lol.