My understanding of the proposed Convention of States as the second Article V option completely bypasses the feds and Congress. The second option in Article V does not require fed approval.
“The Congress, whenever two thirds of both houses shall deem it necessary, shall propose amendments to this Constitution, or, on the application of the legislatures of two thirds of the several states, shall call a convention for proposing amendments,,,”
It is Congress that is charged with calling the Convention,ie time and place, no more no less.