In my opinion he has several options, with Zangiri being the most obvious, but I believe Kuri could simply use Power Mochi in order to hit the spots not protected by the shields without Cracker even noticing too, as he did against Boundman.
The biscuit soldiers are hard, but without Cracker applying haki to them and the shields, they aren't as hard to break, since Cracker even used his shields in combination with haki against G3 and a Hawk gatling.
I give every Yc1 the benefit of the doub't due to portrayal and since they all seem to be a lot more versatile than other Yc.
Kuri is undoubtedly one of the most versatile characters in the enitre manga
King hasn't even fought yet and we already know he's capable of flying, likely sword slashes, hence Aoe and fire related abilitys.
and so on...
Queen maybe, he is a what 60t dinosaur after all? And he does seem to be closer to King than Jack.
Jack definitely not, he might be able to outlast it, or get up quickly due to Awakening, but based on his showings he would get molly whooped. In comparision to Ashura, Neko, Inu, Jack looked like a turtle in comparision to all of them...
Cracker's infinite soldiers work only as good as against Luffy, against a specific group of people-> hence a counter
Meanwhile Kuri's fs works against everyone except top tiers and other fs user...
We know that nothing suggets Cracker's peers as Jozu, Jack or Queen are weaker by any means, they might not get past Cracker's soldiers, hence eventually lose to Cracker, but might win against other Yc, who in exchange could win against Cracker....
A Quote that is should be more valued.
Based on your logic, nothing is a counter, Enel simply should've had better haki or physical stats to beat Luffy, since Luffy only countered one thing, his devil fruit.
I mentioned other examples, who have better means to deal with Cracker's soldiers and none of them is objectively stronger than G4 Boumdman.
Also I never said it's a Enel/Luffy scenario, since yes technically it's possible for Luffy to bypass the soldiers, if he's strong enough, unlike Enel vs Luffy's rubber, but that only works for Luffy if he's a top tier, or has a top tier abilitys as future sight..