Snow.
I think you may have hit on a good idea. One thing you'll have to consider is that it could lead to some confusion, or at least arguments.
Over here we know that we've got Rio Grandes, and most of our turks fit that bill. But, our NWTF state pres, Jon Sabati, has a photo album with pix of some individuals that look more like Easterns; yet all were harvested on the Big Island.
He may have found evidence that a small number of Merriams were also released, but that info may be not be confirmed.
Still, I agree with you that a reference photo collection of sub-species from all over would be good.