Good time for a reminder.
“that blindness in part is happened to Israel, until the fullness of the Gentiles be come in.”, Romans 11:25.
God wrote the phrase: “fullness of the Nations be come in”
This is an old testament quote for Ephraim found in Genesis 48:19.
The phrase “fullness of Nations” can not be used for some non-Israelite people. There is no need for a Plan B or spiritual Israel. Most of true physical Israel is Christian today. We still sin, but Christ did not fail.