I would offer.
The law of signs. Circumcision is a sign to the rebels that refuse to believe prophecy . Prophecy God's word for those who do have faith
And it shall come to pass, if they will not believe thee, neither hearken to the voice of the first sign, that they will believe the voice of the latter sign. Exodus 4:8
A sign is used to represent Christ, our blood husband as to the suffering beforehand .(The sign of circumcision the first born of God).
The sign to represent unbelief in mankind. They did believe the voice of the later sign and all of the un believers first born died. And yet they still refused to believe prophecy as a sign against them.
The parable below (Exodus 4) sets the foundation of circumcision. Our bloody husband Christ is cut off from the land of the living as he drank the cup of wrath, working with the Father not seen in order to finish the work of establishing the government of God. Loving authority plus wiling submissiveness .Strengthened three times to say the words of his father .It is finished. The words the unseen father said to the submissive Son Jesus.
.Below he refers to His Son calling the Son of God the first born. . . Israel. Meaning he who wrestles with flesh and blood and because they have the power of God in them they overcome. As did Jesus our bloody husband as savior. The first born of God
And Moses went and returned to Jethro his father in law, and said unto him, Let me go, I pray thee, and return unto my brethren which are in Egypt, and see whether they be yet alive. And Jethro said to Moses, Go in peace. And the Lord said unto Moses in Midian, Go, return into Egypt: for all the men are dead which sought thy life And Moses took his wife and his sons, and set them upon an ass, and he returned to the land of Egypt: and Moses took the rod of God in his hand. And the Lord said unto Moses, When thou goest to return into Egypt, see that thou do all those wonders before Pharaoh, which I have put in thine hand: but I will harden his heart, that he shall not let the people go. And thou shalt say unto Pharaoh, Thus saith the Lord, Israel is my son, even my firstborn: And I say unto thee, Let my son go, that he may serve me: and if thou refuse to let him go, behold, I will slay thy son, even thy firstborn. And it came to pass by the way in the inn, that the Lord met him, and sought to kill him. Then Zipporah took a sharp stone, and cut off the foreskin of her son, and cast it at his feet, and said, Surely a bloody husband art thou to me. So he let him go: then she said, A bloody husband thou art, because of the circumcision. Exodus 4:18-26
It would seem the Lord met and sought to kill Moses . His feet in that parable to represent Christ.
Zipporah the lamb.
Similar to the Abraham and Isaac parable or also called "a figure". . . which is a unseen understanding working help understand like in the verse below. That "thy seed" is Christ. . the spiritual unseen seed , and not seeds many to represent the things of men seen the temporal flesh .
Hebrews 11:18-20 King James Version (KJV) Of whom it was said, That in Isaac shall thy seed be called: Accounting that God "was able" to raise him up, even from the dead; from whence also he received him in a figure. By faith Isaac blessed Jacob and Esau concerning things to come.
I think Zipporah in that way like the prophetess Deborah were used mightily to show the suffering of our bloody husband before hand and the glory that followed . They received the end of their new born again faith from the beginning also. We look back to that time or reformation. They looked ahead . Their graves were opened the ground shook.
1 Peter1:9-11
Receiving the end of your faith, even the salvation of your souls. Of which salvation the prophets have enquired and searched diligently, who prophesied of the grace that should come unto you: Searching what, or what manner of time the Spirit of Christ which was in them did signify, when it testified beforehand the sufferings of Christ, and the glory that should follow.