Sounds like a very nice dog Sasquatch. I have used German Shorthair's to track for 20 years as well and it is very possible to have your Griffon do it too. I think you will experiance some of the same challanges though. They are intended to bird hunt and not track so much.
He will be wanting to work on air born scent more then on ground scent. You will have to wait 4 hours or more before you begin to work a track with him.
He will want to go too fast. You have to never let him off the 25' leash while doing a search or training track. And keep it very slow. Try to build in some more then usual interesting things like pices of bone or a bundle of hair along the way. Praise him for showing you these things and spend a moment on them to show your dog that you are very interested in these things since they can tell you a lot about the injury while on a real track.
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