Well the World Government absolutely has to have a CP agent in Loadstar Island, so the moment a big name pirate lands there they drop everything and make a B-line for the second to last island with everything.
So at minimum it will be Luffy (and Grand Fleet, I expect them to start moving as soon as someone finds out Luffy is going to Loadstar Island), Blackbard, Shanks, Presumably the Cross Guild because Buggy knows how the 4 Road Poneglyphs work and knows about Zou and Wano having one, so Crocodile can sneak those two at least.
The biggest hurdle for most of the endgame powers might be actually reading the things. Roger did need Oden to translate for him IIRC.
Luffy has Robin
Blackbeard..has to have -something- in his pocket, he didn't name his ship after Xebbec by accident and I think Xebbec had some sort of Information about the Poneglyphs.
Shanks and Buggy need..somebody that can translate the Poneglyphs for them.
It's funny....for all their bluster Law and Kid kind of had zero chance because they can't translate poneglyphs.