Im not saying that any eastern member should be put in b-tier, but they should generally have a pro European stance by not electing right wing populists based on anti EU rhetoric and policymaking.
Of course im not asking for preferential treatment for the west, if any country fails to meet those criteria the mechanism should also halt their voting rights.
There are currently too many ways for any single party to prevent the whole bloc from acting, even if everyone else is in favor or against.