Leaf scratching is not difficult. You want do do it fairly light.
They are feeding, so to imitate it go something like scratch, scratch... pause and repeat, the pause would be the pecking on the ground if you will. Had hens go by on a number of occasions and that's pretty much it.
I ain't so sure about your feather thing, or the "powder" turkey doo is usuallt pretty solid, A glob for a hen, long piece for a Tom.