Are there any resources that show you where pack goats are, and aren’t, allowed? I’ve found a few news articles that explain some access agreements in Wyoming but I haven’t been able to find anything on other western states.
If you're looking for a thinner release I'd look at the Stans. They have a much thinner handle than my TruBalls and also have micro adjust.
Also I wouldn't jump right into shooting a hinge for score at leagues. It takes time and patience to learn to shoot a hinge but it will tell you a lot...