Morality is in regard to what we ought to do and we ought to obey God's character traits, so everything in the Torah is inherently a moral command. God's character traits are eternal, so any interactions that God has given for how to embody His character traits are eternally valid.
Sin was in the world before the Torah was given because people were able to act a way that is contrary to God's character traits before they had been given instructions to refrain from doing that. Moreover, the fact that sin was in the world before the Torah was given mean that there were no actions that became righteous or sinful when it was given, but rather it revealed what has always been and will always be the way to do that.
In Ephesians 2:12-19, Gentiles were at one time separated from Christ, alienated from Israel and strangers to the covenants of promise, having no hope and without God in this world, all of which is in accordance with Gentiles at one time not being doers of the Torah, but through faith in Christ all of that is no longer true in that Gentiles are no longer strangers or aliens but are fellow citizens of Israel along with the saints in the household of God, all of which is in accordance with Gentiles becoming doers of the Torah.
In Romans 2:13-15, Paul said that only the doers of the Torah will be justified and that Gentiles will by nature be doers of the Torah.
In Jeremiah 31:33 the New Covenant still involves following the Torah.
In Matthew 4:15-23, Jesus began his ministry with the Gospel message to repent for the Kingdom of God is at hand, which was a light to the Gentiles, and the Torah was how his audience knew what sin is (Romans 3:20), so repenting from our disobedience to it is a central part of the Gospel message, which is the Gospel that Peter argued in Acts 15:6-7 that Gentiles had heard and believed, so he was a agreeing with the Pharisees among the believers that Gentiles should obey the Torah (Acts 15:5). In Ezekiel 36:26-27, God will take away our hearts of stone, give us hearts of flesh, and send His Spirit to lead us in obedience to the Torah, which is in accordance with Acts 15:8-9 where Peter argued that the Gentiles had received the Spirit and had their hearts cleansed, so again he was agreeing that Gentiles should obey the Torah. In Psalm 119:29-30, he wanted to put false ways far from him, for God to be gracious to him by teaching him to obey the Torah, and he chose the way of faith by setting it before him, so this has always been the one and only way of salvation by grace through faith, which is in accordance with Acts 15:10-11 where Peter argued that Gentiles are saved by grace just as we are, so again he was agreeing that Gentiles should obey the Torah. No one there was opposed to Gentiles following Christ's example of obedience to the Torah, but rather the topic they were discussion was whether salvation is by grace (Acts 15:11) or by circumcision (Acts 15:1).
Christ said that man shall not live by bread alone but by every word that comes from the mouth of God (Matthew 4:15). Christ also set a sinless example for us to follow of how to walk in obedience to the Torah and we are told to follow is example (1 Peter 2:21-22) and that those who are in Christ are obligated to walk in the same way that he walked (1 John 2:6). So Christ spent his ministry teaching his followers to obey the Torah by word and by example and I see no justification for thinking that the Law of Christ is something contrary to anything that Christ taught or anything that has come from the mouth of God.
Everything in the Torah is either in regard to how to love God or how to love our neighbor, which is why Jesus said in Matthew 22:36-40 that those are the greatest two commandments and that all of the other commandments hang on them, so the Torah is LOVE. For example, if we love God and our neighbor, then we won't commit idolatry, adultery, murder, theft, bear false witness, or covet, but we also won't commit favoritism, rape, kidnapping, and so forth for the rest of the Torah. In Deuteronomy 6:4-7, the way to obey the greatest commandment in the Bible is essentially by being zealous for teaching the Torah. The way to love God is by embodying His character traits, so the way to love justice is by being a doer of justice, the way to love holiness is by being a doer of His instructions for how to be holy as He is holy, and so forth. In other words, the goal of everything in the Torah is to teach us how to love different aspects of God's character traits, which are the basis for morality, and which is why the Bible repeatedly states in both the OT and the NT that the way to love God is by obeying His commandments.
You're wall of text collapsing categories the Bible refuses to merge: God's eternal moral righteousness is not the Sinai covenant & Torah is not the New Covenant law of Christ.
Paul says the Law was added until the Seed came (Gal 3:19), has been abolished as a covenant (Eph 2:15) & is a fading ministry (2 Cor 3:7–11). While also saying sin existed long before Moses (Rom 5:13–14) & that Gentiles were never under Torah (Rom 2:14; Eph 2:12; Acts 15).
Peter's entire point in Acts 15 is that God purified Gentile hearts by faith without Torah & that placing them under the Sinai code is a YOKE Israel itself couldn't bear (Acts 15:9–10).
Jeremiah says the New Covenant is not like the Sinai covenant (Jer 31:32) & Paul is explicit that believers are under Christ's law, not Moses' (1 Cor 9:21 & Gal 6:2). Your system only works if you erase every distinction the apostles build their theology on.