Calvin would have taken it directly from the OT sacrifice system, as pointing towards the sacrifice of Messiah as sin bearer for the sins of His people, and tied divine wrath into the Cross by the many statements regarding the bowl/cup of wrath of God in OT, but where Wright gets his from?
The Old Testament sacrifice system certainly had its many types, but the NT considers only one when it comes to redemption.
That one is concerning the furniture (which Paul referred) and the Blood (which John referred). It is that Lamb slain. The slaying of the lamb was not torturous, nor inhumane.
So then why the suffering Saviour?
All the suffering was to fulfill prophecy as to
WHO (the identification tag) was to be the actual messiah.
God knew (as John and Paul state) there would be multiple claims to being the messiah, just as there will be many who can carry the label anti-Christ.
But, just as Peter was able to point to the exact person, in that first sermon, so we, too, may see the suffering as appointed and pointing out just who is the Redeemer.