I think I would disagree with George, in that the intent of the limitation is to not dump fuel with the flaps between 1 and 5; whether or not they were jammed or in transit. However, seeing as how you would have probably declared an emergency, you can do pretty much whatever you like, though, you will have to explain your actions.
I think this is a sim instructor scenario. Not sure if Boeing thought it was ever likely to happen;ergo, not worthy of a special procedure.
Just my sunday morning opine.