Yes, it is fine. Not sure it will do much though, since you do not have the same set up as a rectum. It is a stimulant laxative and without the rectal musculature to stimulate, not much may happen. Even a simple tap water enema will likely give you better results. You are probably better off with taking oral stool softeners (colace) or gentle laxatives like Miralax.
Did the CT show that your pouch was full of stool?
Jan