Might I suggest taking the whole of the skin off while butchering at that age, then process into either "hamburger" or sausage? The mechanical maceration creates the impression of tenderness, you can add additional fat if required (and ensure its well distributed), while the stronger flavor of the aged bird holds up nicely to those typical preparations - smoking, dry rub aging, etc. Legg's "Snack Stick" seasoning, for instance, makes a nicely seasoned chicken burger whose flavor doesn't disappear under pickles, tomato, katsup/ketchup, cheddar cheese, jalapeno jack, or even barbq sauce (Sweet Baby Ray's Chipotle Honey), banana pepper/pepperoncini rings, and sharp cheddar on fresh sourdough buns (a personal favorite - with fries, not seasoned) and a side of mayo-based coleslaw.