Not really.
Look, I get the strategy you all are talking about. If you get hegemony WAY before everyone else you can position 3-4 explorers in one continent then do the research there. Then move on to the next continent. This ties victory merely to getting to hegemony first, which was the entire problem pre "fix".
Now, maybe you get hegemony a couple turns after an AI, and maybe you can tell which continent they are delving, and go to another continent with 4 explorers that hasn't been researched yet and grab all 4 artifacts.
Beyond that, there's no strategy. Just keep 2 explorers in your continent and 2-3 in another and the second sites appear, rush for them. Or, as others have said, just purchase the explorers in the closest settlement.
The idea that having lots of culture is needed for a culture victory is just not correct. There's a very limited case for that.
In the Modern Age, a better use of culture yields would be to spend culture to put ideological pressure on settlements, in the context of a world war. Then ideology needs to be reworked to activate sooner.