I would try a rustic approach.
Although it's counterintuitive, put out a water bowl and some birdseed (not parrot seed). I think parrots are gregarious but only amongst themselves. If magpies, noisy minors, New Holland honeyeaters and a range of other birds show up the parrots will keep flying to a different feeding ground.
If the parrots live locally, I would dissemble straw bales into their biscuits and scatter the biscuits over the new shoots of the rose bushes. This will look untidy but will only be required until the new wood hardens. You can use it as mulch afterwards.