I have started re-reading a book by R.C. Sproul. "The Soul's Quest For God." He has a chapter in it on loving the law of God, where he puts it very well. "Therefore, in a narrow sense, it is appropriate to distinguish between the Law and other portions of the Word of God. However, in the broader sense, the two are to be identified as one. Not only is all the written Law of God also the written Word of God, it is equally true that all the Word of God is also the Law of God." There is much more to that chapter but it is a good summary, lining up with what I think you are saying.
I agree.
The Law taught the Israelites the righteousness of God, and what obedience to God is, and it also teaches us that. The Law at the same time, condemned them because they could not keep it by the standard of perfection that is God's standard. We cannot keep it either. Jesus kept it for us. So the Law no longer condemns us, and it does not save us and was never meant to save them. It no longer condemns us because Jesus fulfilled it in our place. But it still teaches us what God's righteousness is, and God still requires obedience. (Some portions of the law have been abrogated. The ceremonial laws for Jesus is the final and perfect sacrifice. And the dietary laws.) The spirit of the Law---God's righteousness through sanctification of the believer---is still in effect. It is the Holy Spirit who sanctifies, not we ourselves. Jesus' statement "If you love Me, your will keep My commandments," still stands. They do not save us, but they are our obligation to God.
The position that we can't keep the law is the position that God gave it with the goal of condemning His children, which is expressing an extremely negative view of God when the reality is that God knows how to give good gifts to His children. Not even early fathers give instructions to their children with the goal of condemning their children, but rather they give instructions to their children for their own good in order to teach them how to rightly live, and this is that much more true of our Heavenly Father (Deuteronomy 6:24, 10:12-13). Furthermore, if God gave us a law that we can't keep, then we could rightfully place the blame for our failure to keep it squarely on God, and it would be unjust for God to condemn us for failing to do something that we are unable to do.
The reality is that Deuteronomy 30:11-20 says that God's law is not too difficult or us to keep and obedience to it brings life and a blessing while disobedience brings death and a curse, so choose life! So it was presented as a possibility and as a choice, not as something that we are unable to keep. Moreover, Romans 10:5-10 references Deuteronomy 30:11-20 as the word of faith that we proclaim, which is the word of faith that you are denying by denying that we can keep God's law. Likewise, in 1 John 5:3, to love God is to keep His commandments, which are not burdensome, so to deny that we can keep God's law is to deny that anyone has ever loved God and to deny that his commandments are not burdensome. In addition, there are many examples of people who did keep God's law, such as those in Joshua 22:1-3, Luke 1:5-6, Revelation 14:12, and Revelation 22:14.
God's law came with instructions for what to do when the people sinned, so it never required us to have perfect obedience. The fact that we can still repent and be saved after we have sinned again demonstrates that we do not need to have perfect obedience. Nowhere does the Bible say that Jesus deprives us of salvation by keeping God's law for us and it would be unjust if he did that. The reason why God's law does not condemn us is not because Jesus kept it for us, but because it only condemns those who refuse to submit to it. In Romans 8:1, there is no condemnation for those who are in Christ, and in 1 John 2:6, those who are in Christ are obligated to walk in the same way he walked, so there is only no condemnation for those who are walking in obedience to God's law. Jesus fulfilled God's law by spending his ministry teaching us how to obey it by word and by example, so that we would follow what he taught, but he did not remove our salvation by fulfilling it in our place.
All of God's righteous laws are eternal (Psalms 119:160), so none of them will ever be abrogated. The only way that eternal laws for how to testify about God's eternal righteousness can be abrogated is if God is no longer eternally righteous. In 1 Peter 1:16, we are told to be holy for God is holy, which is a quote from Leviticus where God was giving instructions for how to do that, which includes refraining from eating unclean animals (Leviticus 11:44-45), and the only way that eternal instructions for how to be holy as God is holy can be abrogated is if God is no longer eternally holy. Those who refuse to follow God's instructions for how to testify about God's holiness bear false witness against Him by living in a way that testifies that He is not holy. If the spirit of the law is still in effect, then so are all of the things that are examples of it, which you falsely claim have been abrogated. By obeying God's laws for how to testify about God's righteousness and holiness we are expressing our love for God's righteousness and holiness, and the same is true for other aspects of His nature, so everything that God chose to command was commanded for the purpose of teaching us how to love different aspects of God's nature, which is why there are many verses in both the OT and the NT that connection our love for God with our obedience to His commandments. For those who falsely claim that God's commands for how to be holy as He is holy have been abrogated, holiness is simply not an aspect of God's eternal nature that they love. God teaching us to be holy as He is holy is the way that He saves us from not being holy.