Peter, if I’ve understood you correctly, I would agree with your comment. I suspect we would handle the details differently, but I think it makes sense to see the story of Israel and its salvation through Jesus as a microcosm—summation, encapsulation—of what God was doing in the midst of the nations, and further in the cosmos.
I don’t understand your point about the “gifts of grace” though. I did not mean to suggest that they are “disconnectedly or randomly” given to the Gentiles. On the one hand, they are the overflow of God’s mercy to his people Israel; on the other, the Gentiles are as much “chosen” as the Jewish believers.