I think where you are going here is gettin to the point where folks that say they only do positive reinforcement run into a wall. I would as i said earlier use a check cord that i could step on so the dog could not break. I realize though that at 6'5'' 240 i can stop alot more dog than most ( i speak from experience being married to a 5'2'' 110 wife, telling here to step on the check cord=me sleeping with the dogs that night). That is not purely positive. Also with birds flying around, the dog would be on a lead and when he is not steady, i would remove hime from the situation.
example: bread and ducks at a park. Make dog stay at heel, if he pulls or breaks turn around. The reward is being close to the warm feathery things. The dog learns to buy the reward by staying at heel and being steady.
I won't have a dog that will be a MH, and thats fine. I am not really sold on those tests being the basis of breeding. I think it shows tremendous trainability of a dog to reach that level which is amazing. It just doesn't spark my engine. If I as a husband, father, dentist, flyfisher, and duck misser can train a dog for 5-15 minutes for three times a week and have a dog that is steady and able to perform blind retrieves out to 90 or so yards, i am happy.