The result of what we see is not a good edifying Christian debate but rather just an argument with each side disclaiming the other in an attempt not to learn and grow but to score points, puff themselves up, and tear the other down.
I think
Jethro Bodine makes a good point. That is, Paul does have the call for Israel (all Israel, all
His people) to repent and not reject Christ (Messiah) in mind within Romans 11 (including 11:29). The issue is, however, he also has
the full number of Gentiles in mind as well. That same
irrevocable call applies to all of
His people (Jews and Gentiles), not just to Jews. And it applies individually AND collectively. You just cannot get to a group without individuals. And it is not just the call that's irrevocable but the gifts of God (clearly including Eternal Life among those gifts) as well as the call.
Romans 11:2, 7, 25-26, 29-32 (LEB) God has not rejected his people, whom he foreknew! Or do you not know, ... they did not stumble so that they fell, did they? May it never be! But by their trespass, salvation has come to the Gentiles. ... 25 For I do not want you to be ignorant, brothers, of this mystery, so that you will not be wise in your own sight, that a partial hardening has happened to Israel, until the full number of the Gentiles has come in, and so all Israel will be saved, just as it is written, ... 29 For the gifts and the calling of God are irrevocable. 30 For just as you formerly were disobedient to God, but now have been shown mercy because of the disobedience of these, 31 so also these have now been disobedient for your mercy, in order that they also may now be shown mercy. 32 For God confined them all in disobedience, in order that he could have mercy on them all.
Just as you (gentile believer) were formerly disobedient (like them), God has not and will not (never) reject His people.