I am separating this for clarity.Where you are lacking is that with what you say we could identify with Christ in his victory over sin and death without him having to be under any kind of curse or under consequences of sin - because as soon as you make that a necessity you are looking at substitution and a necessity of his actual death, in accomplishing something on our behalf.
I am not sure how you make the claim.
I said that Christ suffered and died under the wages of sin - under the powers of darkness authored by Satan - just as we suffer the wages of sin. But that Christ suffered under the wages of our sin. I said He shared our infirmitiy and came under the curse he did not earn.
Then I said that what Christ did earn under God's covenant was the blessings due to obedience (we earned the curse, He earned the blessings).
The purpose of the Cross was that Christ suffer under the "powers of this age", under the product of sin. This is what we will suffer. But we have victory in Christ because He had victory over those powers.
Christ is to the Christian what Adam is to natural man. He is the "Second Adam". We are redeemed in Christ where we were condemned in Adam. Both was solidarity.
I am not sure how you get that I say we could identify with Christ in his victory over sin and death without Him having to be under any kind of curse or under consequences of sin. I actually did not say that. I said the opposite .
I insisted that He shared our infirmitiy, became a curse for us. That He suffered the wages of sin we will suffer, but unlike us they were not earned by Him.
AND I said this repeatedly...and in replies to you.