Here's a few more besides A.E. Knoch's translation...
New Living Translation
For God made Christ, who never sinned, to be the offering for our sin, so that we could be made right with God through Christ.
Anderson New Testament
for he has made him, who knew no sin, a sin-offering for us, that we might become the righteousness of God in him.
Haweis New Testament
For he hath made him, who knew no sin, to be a sin offering for us, that we might become the righteousness of God in him.
Haweis New Testament
For he hath made him, who knew no sin, to be a sin offering for us, that we might become the righteousness of God in him.