The problem Dispy is in your dismissal of the Covenant which God has made with ALL the Elect. God did not wait for 4000 years to start election. It started before the world began. Thus GOD'S PEOPLE were prepared and elected from the beginning. God did not start HIS salvation plan with the NT, His purpose began with Adam and Eve. Your premill disp stuff chops the Bible up and rejects God's election in the OT. BUT it has been going on throughout the OT and continues today.
ROM 9 "For they are not all Israel, which are of Israel:" "For the children being not yet born, neither having done any good or evil, that the purpose of God according to election might stand, not of works, but of him that calleth" "Even us, whom he hath called, not of the Jews only, but also of the Gentiles?" "Esaias also crieth concerning Israel, Though the number of the children of Israel be as the sand of the sea, a remnant shall be saved"
Ro 11 "I say then, Hath God cast away his people? God forbid. For I also am an Israelite, of the seed of Abraham, of the tribe of Benjamin" "God hath not cast away his people" "thou bearest not the root, but the root thee"
Rom 9+11 Rejects the Break up of the elect at any point