Paul in II Corinthians 3 refers to the Old Testament as the Ministration of Death. Paul furthermore implies that the reason for that death was ignorance and misunderstanding as symbolized by the veil. Death did not result so much from the inability to keep the rules perfectly. Instead it came because rule keeping doesn’t bring life in the first place.
More death could not be where Jesus was leading mankind in His message. If that message involved continued obedience to God’s demands, a renewed sense of God’s need for our worshipful attention, and a continuing recognition of mankind’s unworthiness, then Jesus and Moses are both equally deadly. Same approach leads to the same outcome. Jesus warned against putting new wine in old wineskins, so why is His teaching always diluted by Old Testament Judaism, in the doctrines of the church?
The difference between Christ and Moses, the difference we see played out in the Old and New Testaments, is the difference between life and death. We can’t embrace death as a way to live. Moses practiced death and should remain dead in our understanding of God.
There is no way to combine the ministration of death and that of life and obtain anything that isn’t toxic.