I will be one to say that the Law is of the spirit. As it is meant to show how to live a life that is shall we say, spiritual clean. It has some to do with the acts yes, yet in the end, it is more about our relationship with HaShem. As that is not a physical thing, the law really can't help in this if it is only physical.
The Sabbath , was, is, and will remain, a part of the law. If one wishes to follow it may HaShem bless them, and keep them grounded.
Your reasoning is clear, and based on solid logic. The Sabbath was given to man, from the days of creation. What we must understand is that the Sabbath was made for Man, not man for the Sabbath.
I think you will find that folks that don't keep Shabbot, (Sabbath) will do their best to push o you what they think you need to follow. Rather than just answering question, and letting You work out your salvation between HaShem and your self. As you can tell if you have rad this thread, many seem to act out of what seems to be hatred, or fair. I can only it seems that way, as I can't see their hearts. Though like you, I have wanted to have a nice respectful diolog with someone that follows the Sabbath is not a day. I find it odd, that something that has been changed by man and not HaShem can become so loved, and what HaShem told us, so hatted.
When the Law was given, one finds that it reads as though it was meant to be clear. With all the divisions, and in some cases, sub-divisions,. HaShem went to great length to make it clear as a bell. You will find many in this world only wish to push their ideas and beliefs on others. All the time saying they are not. Yet when push comes to shove, they turn the same old tactics that were aimed at Yeshua. Ask something that is meant for only one thing, to discredit the one you are asking. They place i a way that if you answer one why they jump up and say got you. If you answer it another, same thing.
I am not going to say that everyone does this. Their really are some good people on here, that are simply looking to make clear what you are asking or saying. As you wil find in my post answering this same thing in the tread on the Sabbath, I am not here to change anyone. Your salvation is between you and HaShem. I can do nothing about what you think or do, I can only try to understand it.
Sorry seen that rabbit had to chase it. Back on track now.
What you rd in Paul is right, the law is to point us to salvation. It is the mark we are to shoot for. No one can live it out in their life to the letter, that is what Salvation through Yeshua is for. All the Law can do is point out our wrongs, and show us where we to work to improve. Will I call the Spiritual? YES with out any second thought. If it was not, then it would have way to help us in our spiritual walk with HaShem. Is it also literal? Yes, in that one should do their best to live it out in their lives. Keep in mind, that not all aspects of the law are for every peoples of the earth. Their are parts that are for Israel and only Israel. Though some, (if you take a path of doing you best to uphold the Law) will try to place parts of the law on you that are not yours to bare. If at any time you are not sure, you are always free to ask me anything. You will not be pushed to do anything, you will not find condemnation, nor anything but a kind and loving answer. One that will stand teh test fo both time and Scripture. Well ok, assaults by any that simply know enough about the Law to be a danger to them self and others.
I do hope this helps.