I've never worked with a wirehaired pointer, But an E-collar and the command" GIVE" , "DROP", or "RELEASE" can work miricles! But if you have never used one you should definatly read on the proper use first or you can mess up the whole prossess. The book I used when first getting started was the tri-tronics introduction book.
I also force fetch my labs. Force them to hold something in their mouths and then force to release untill they get the idea. It takes a lot of patients. But I don't know about using this on wirehaired you should do a search on wirehaired trainers and contact them.