More private faux "historicism". No recognized Reformation historicist ever subscribed to such futurized fantasy and fallacy.
FYI Isaiah and Zechariah are in the OT.
Reformation historicist John Calvin:
Isaiah 11:4
Here we must again call to remembrance what is the nature of Christ's kingdom. As he does not wear a golden crown or employ earthly armor, so he does not rule over the world by the power of arms, or gain authority by gaudy and ostentatious display, or constrain his people by terror and dread; but the doctrine of the gospel is his royal banner, which assembles believers under his dominion. Wherever, therefore, the doctrine of the Gospel is preached in purity, there we are certain that Christ reigns; and where it is rejected, his government is also set aside.
Reformation historicist Adam Clarke:
Isaiah 9:7
"This is an illustrious prophecy of the incarnation of Christ, with an enumeration of those characters in which he stands most nearly related to mankind as their Savior; and of others by which his infinite majesty and Godhead are shown. He shall appear as a child, born of a woman, born as a Jew, under the law, but not in the way of ordinary generation. He is a Son given - the human nature, in which the fullness of the Godhead was to dwell, being produced by the creative energy of the Holy Ghost in the womb of the Virgin. See
Matthew 1:20,
Matthew 1:21,
Matthew 1:23,
Matthew 1:25, and
Luke 1:35, and
Isaiah 7:14, and the notes on those passages. As being God manifested in the flesh, he was wonderful in his conception, birth, preaching, miracles, sufferings, death, resurrection, and ascension; wonderful in his person, and wonderful in his working. He is the Counsellor that expounds the law; shows its origin, nature, and claims; instructs, pleads for the guilty; and ever appears in the presence of God for men. He is the mighty God; God essentially and efficiently prevailing against his enemies, and destroying ours. He is the Father of eternity; the Origin of all being, and the Cause of the existence, and particularly the Father, of the spirits of all flesh. The Prince of peace - not only the Author of peace, and the Dispenser of peace, but also he that rules by peace, whose rule tends always to perfection, and produces prosperity. Of the increase of his government - this Prince has a government, for he has all power both in heaven and in earth: and his government increases, and is daily more and more extended, and will continue till all things are put under his feet. His kingdom is ordered - every act of government regulated according to wisdom and goodness; is established so securely as not to be overthrown; and administered in judgment and justice, so as to manifest his wisdom, righteousness, goodness, and truth. Reader, such is that Jesus who came into the world to save sinners! Trust in Him!"