Sikaflex would go too hard.
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It doesn't. They're very very difficult to move on. Shooting one or two doesn't deter the others. They're very cunning too. They make heaps of noise most of the time but when they're in the orchard they're silent. They know that if they make themselves conspicuous the grumpy farmer will come down and do something unpleasant. Also it's difficult to get a clear shot in the orchard and they know how to stay concealed or just out of range. Apart from all that, shooting native wildlife isn't exactly one of my hobbies. I have tried many things to get them to move on with limited success. If I can just keep them off the irrigation pipe we can all be happy.
If you string a single wire between the posts that are currently holding your poly, and then suspend the poly from the wire on hangers about 150 mm long, then the birds shouldn't be able to land on the poly.
If the wire is thin enough, they wont be able to grab it, and if at the right height, they wont be able to land on the poly either.