I think both are a great ideas! All of your ideas were great! I dont know much about goats so will just take your word for that one :)
My current kitties are both uneasy with those types of sudden noises. Although my sweet old man kitty that just passed did try and eat any plastic he could get his paws on.(plastic eating not related to passing) The ribbon attached to helium balloons was his fave. It was a constant challenge to keep him plastic free.
i had a little buddy who was exactly the same way - he'd even try to eat the plastic bags after i'd shake them and set them down. memory of a goldfish sometimes, i tell you what!