Re:Auto Site code Assignment
Add a step to your TS to clear the SCCM site code and set it to "Auto". When the client boots up on the new environment, it will discover the new site code based on boundaries.
You can also create a run-once script/GPO.. etc.. to automate this.
What you don't tell us, we will never know...
"Meanings are inside people, not in words" - Dr. Myles Munroe