I had my hysterectomy before my j-pouch surgeries. I have read in here about involvement with j-pouches. In one particular they had to remove her uterus as it was attached or wrapped around her j-pouch. They knew this before going in. If I were you I woukd at least call Cleveland. The practice of having a colorectal surgeon in during the hysterectomy is common. I know it is a pain having surgery away from home as I live around 4 hours from Mayo but feel better getting my surgeries there.
Best wishes for your surgery and recovery!