Can't help with the Griffon, if you consider a German Wirehaired Pointer, which has a good bit of Griffon, I think you may find what you're looking for. I am transitioning from owning labs primarily used to duck and dove hunt to the GWP. I find myself wanting to Quail hunt more and more. As such, I wanted more of a pointer, but a breed that could still do some retrieving when duck and dove hunting. I also wanted a dog that doesnt shed much, as the labs left a lot of hair in the house and truck. What I have leaned so far when comparing my pup (17 weeks) to my labs. I am just referring to my experiences and not trying to categorize all labs and all GWPs.
My labs were better natural retrievers, more willing to please me during training sessions, easier to potty train, more sensitive to corrections.
My GWP is already pointing quail, very intelligence but wants to learn why as opposed to just doing what I condition. The GWP is a rocket on land, has a significantly better nose, barely sheds, strong prey drive but slower to return retrieves, less sensitive to verbal corrections, and is absolutely fearless.
Overall, I am happy transitioning to the GWP. However, if I primarily wanted a duck hunting partner, I'd do a lab. With that said, I plan to upland hunt more and duck hunt less, so the switch looks like it will be worth it. Ill attach a pick of the father. My pup is shaping up to look very close to him.