First, your perception of “national Israel” is unscriptural; it contradicts or is oblivious to what the prophets foresaw. Christ came to punish the shepherds and scatter the sheep,
Awake, O sword, against my shepherd, and against the man that is my fellow, saith the LORD of hosts: smite the shepherd, and the sheep shall be scattered: and I will turn mine hand upon the little ones. (Zechariah 13:7)
The tenants were ordained to reject or smite the shepherd, and two parts were to be “cut off and die, but the third shall be left therein” (Psalm 118:22; Zechariah 13:8). Romans 11 agrees with what had been prophesied. By these acts, the sheep were scattered, which Christ prophesied as “the kingdom of heaven (God),”
The kingdom of heaven is likened unto a man which sowed good seed in his field. (Matthew 13:24)
The good seed is the remnant in Romans 11, not the “enemy of the Gospel,” to coin the term you like to use. It’s a farce to interpret the good seed as the Jews who were/are blinded “until the fulness of the Gentiles be come in” (Romans 11:25). As Paul states, “they are not all Israel, which are of Israel” (Romans 9:6).
It follows the good seed is the true Israel, mixed with the Gentiles, which Zechariah prophesied,
And they of Ephraim shall be like a mighty man, and their heart shall rejoice as through wine: yea, their children shall see it, and be glad; their heart shall rejoice in the LORD. I will hiss for them, and gather them; for I have redeemed them: and they shall increase as they have increased. And I will sow them among the people: and they shall remember me in far countries; and they shall live with their children, and turn again. I will bring them again also out of the land of Egypt, and gather them out of Assyria; and I will bring them into the land of Gilead and Lebanon; and place shall not be found for them. (Zechariah 10:7-10)
Zechariah prophesied after the return from Babylon, so he prophesied of another sowing “among the people,” specifically the Northern Kingdom of Ephriam, and they are mixed with the Gentiles according to Hosea,
Ephraim, he hath mixed himself among the people; Ephraim is a cake not turned. (Hosea 7:8)
The true Israel, Ephriam, is hidden amongst the Gentiles, represented in the parable of the treasure “hidden” in the field. Ephraim is the “pearl of great price” and the “good” gathered into vessels. But they are not gathered until the fullness of the Gentiles when all will avow CHRIST AS KING,
And say unto them, Thus saith the Lord GOD; Behold, I will take the children of Israel from among the heathen, whither they be gone, and will gather them on every side, and bring them into their own land: And I will make them one nation in the land upon the mountains of Israel; and one king shall be king to them all: and they shall be no more two nations, neither shall they be divided into two kingdoms any more at all: Neither shall they defile themselves any more with their idols, nor with their detestable things, nor with any of their transgressions: but I will save them out of all their dwellingplaces, wherein they have sinned, and will cleanse them: so shall they be my people, and I will be their God. (Ezekiel 37:21-23)
There is simply no avoiding it; the enemy of the Gospel will be cast out to gnash their teeth when Christ returns to establish his kingdom,
And I say unto you, That many shall come from the east and west, and shall sit down with Abraham, and Isaac, and Jacob, in the kingdom of heaven. But the children of the kingdom shall be cast out into outer darkness: there shall be weeping and gnashing of teeth. (Matthew 8:11-12)
The Jews in Palestine are not "the Israel of God!"