Well I never heard of Albertus Pieters. He may well be (or have been) a scholar, but I question that he's Reformed if he shares your view.
We can certainly agree that the Ten Commandments occupy a higher position than the civil and ceremonial laws. I have agued that above. However, the Decalogue and the Sinaitic Covenant are not identical for three reasons:
1. Jeremiah 34:13-14; Ezekiel 44:6-8; Hebrews 9:1 & 9:18 are Biblical commentaries on the Sinaitic Covenant , but clearly identify that covenant with other things than the Decalogue.
2. Jeremiah 31:31ff says that the Ten Commandments will still function in the New Covenant.
3. All the commandments in the Decalogue pre-date that covenant (Exodus 19ff).
1. You shall have no other gods before Me. Genesis 17:1.
2. You shall not make for yourself a carved image. Genesis 35:2.
3. You shall not take God's name in vain. Exodus 5:2.
4. Remember the Sabbath day. Genesis 2:1-3; Exodus 16.
5. Honour your Father and Mother. Genesis 9:22; 26:34-35.
6. You shall not kill. Genesis 9:5-6.
7. You shall not commit adultery. Genesis 39:9.
8. You shall not steal. Genesis 31:32.
9. You shall not bear false witness. Genesis 3:4-5.
10. You shall not covet. Genesis 3:6.
Also, I suggest to you that when Adam took the apple, he put Satan's word before that of God, made an idol of his stomach, dishonoured his heavenly Father, coveted that which God had withheld from him and stole it, and killed all his progeny. That's six of the ten Commandments broken 2,500 years before the Sinaitic Covenant.
I hope we can.

It's a fascinating subject.