Its your wedding, not his. Do you think he'll rmember it fondly in years to come. Personally, unless he's your bestest best buddy ever, and you ain't marrying him, I'd kick him into touch.
Alternatively, tell him you've organised a team of people to sort everything from the stag do to the speech - in effect just make him the mouth piece on the day.
Alternatively, tell him you've organised a team of people to sort everything from the stag do to the speech - in effect just make him the mouth piece on the day.