The promise of Romans 11 is that "all Israel" will be saved. I take "all Israel" to mean all those from the physical descendants of Israel that God has chosen in Christ to be saved. This is an ongoing process that will continue "until the fullness of the Gentiles has come in." It says nothing about a physical restoration to the land or rebuilding of the temple. They are being restored by being grafted into the root, that is, Jesus Christ, just as believing gentiles are grafted in.
If there is no physical restoration of the Jews to Israel, how can the unfulfilled prophecies of Zechariah regarding Jerusalem and the nation of Israel ever be fulfilled? Are you saying that "spiritual" Israel (i.e., saved Christians of whatever ethnic background) are going to be living in Israel and in Jerusalem when these events happen?
I don't think so. Christians are not the "house of Judah." You are trying to rob the children of Israel of promises God made only to them.