If you become grafted into the true Olive Tree, no matter what nation you come from, you become a member of the Commonwealth of Israel.

Not according to Scripture, everybody since the 'change' that came with Peter's vision that resulted in the Gospel being preached to the Gentiles means that every man/woman/child on earth since that event is part of this verse below. That also means the 7 letters that follow are to them and every relationship that God recognizes is contained in those letters. Like it or not that is how people will be sorted by God and by His Messiah when He returns. To remain alive means you will be from the 'over-comers'. If you have not repented your sins by the sound of the 7th trump you will die as part of the 2/3 of all of mankind that die on that very day.

Re.15:5
And after that I looked,
and,
behold,
the temple of the tabernacle of the testimony in heaven was opened:
Re.15:6
And the seven angels came out of the temple,
having the seven plagues,
clothed in pure and white linen,
and having their breasts girded with golden girdles.
Re.15:7
And one of the four beasts gave unto the seven angels seven golden vials full of the wrath of God,
who liveth for ever and ever.
Re.15:8
And the temple was filled with smoke from the glory of God,
and from his power;
and no man was able to enter into the temple,
till the seven plagues of the seven angels were fulfilled.

For those final years you would seem to have two options, be chosen by God to be one of the 144,000 from the 12 Tribes (children in that they do not have any power from god to facilitate their own protection, rather it is the two witnesses that are Christ's power on earth at that time) or you can become a member of one of the Churches that is an 'over-comer' and that would be 1/3 of mankind, that would seem to give you the better chance of remaining alive during the trumps.