They are called Ten not 9 or 11 or 101 commandments and God distinctly made two different laws.
After speaking the Ten Commandments
Deu 5:22 These words the LORD spake unto all your assembly in the mount out of the midst of the fire, of the cloud, and of the thick darkness, with a great voice: and he added no more. And he wrote them in two tables of stone, and delivered them unto me.
Written on Stone and He added NO MORE. How are the 10 C an overview of the entire Mosaic Covenant? There is no overview of the sacrificial service in the 10 or any overview of the dietary requirements?
Who has the authority to add or take from Gods Law?
The laws that were given to Moses were about life and rules to live by, like the rules we have today to keep order (like speed limits) and they were laws about sacrifices and offerings, they were about new moons and festivals, and they included yearly Sabbaths or Sabbaths that were different to the weekly Sabbath.
Some of the ceremonies were offerings for sin and they were a shadow of the coming messiah. "Take a lamb, bull and transfer your sins to it and kill it", Lev 4. To do this ceremony after the death of Jesus would be a denial of the death and payment that Jesus gave. Heb 9:12
You said "a spirit-led Christian can read the Mosaic Covenant and discern, with spiritual eyes, the spiritual and moral principles underlying the specific application given to ancient Israel, and apply those."
So to read the principles about diet and lifestyle and believe it was Gods recommendation for His people and it was healthy for them, than i am not a judaizer because i follow some of those laws. If not eating Pig was something that God told the Jew to do for their GOOD and God knows what is best than, and i want what is best for my health than i'll follow that command.
I could go on but you have heard it all before.....
i just can't see how you can take the 10 and turn it into 9 because you don't see it as a moral commandment or because you see it as a shadow. Yes Jesus is our continual rest but that isn't grounds to do away with the commandment that God said to remember and placed in the middle of the other 9, in stone.
The Sabbath was given before there was ever a Jew and before there was sin.
James clearly states many years after the death of Jesus that to break one of the Ten is to break all.
Jas 2:8 If ye fulfil the royal law according to the scripture, Thou shalt love thy neighbour as thyself, ye do well:
Jas 2:9 But if ye have respect to persons, ye commit sin, and are convinced of the law as transgressors.
Jas 2:10 For whosoever shall keep the whole law, and yet offend in one point, he is guilty of all.
Jas 2:11 For he that said, Do not commit adultery, said also, Do not kill. Now if thou commit no adultery, yet if thou kill, thou art become a transgressor of the law.
Jas 2:12 So speak ye, and so do, as they that shall be judged by the law of liberty.
Could He say, if you keep all nine and forget the Sabbaththou art become a transgressor of the law.