What’s the projected wind like?
i think the sprinklers might be a viable way to go.
it takes the same amount of (heat) energy to cool water from 176F to 32F as it takes water at 32F to go to ice at 32F.
You don’t have to continuously spray. You just need to make sure there is enough water to freeze around. So as soon as stuff is no longer “wet” but just coated in ice, you need to water again.
If you have a timer you could let the sprinklers run a few minutes every 15 minutes or so.
you do need to make sure the sprinklers hit the blossom. Having the ground wet but not the blossoms does little for you.
This has also been discussed in this topic.