I taught Cassie Hand Touch, it's easy to teach and in her case I can make it quite quick and high energy thereby keeping her focus. I gradually started throwing a dummy as part of the game ( a ball would be wasted as she doesn't play that game) , I would hold out my hand a say "Touch" when she shoved her nose/mouth into my hand I'd hold the dummy while she still had it and say Thank you" When she released it I threw her treat away for her to find, as areward.
I think I did a few other clicker related things but can't remember enough of what I did, bit of a multi pronged approach really, but now she has a really good hand delivery.
I do remember my gundog trainer telling me to keep my hands behind my back as she approached, instead of reaching out for it. She began then to look for my hand which I presented at the last minute.
Does Hunter work for food?