Grasshoppers are migratory. No matter how many you pick off, others in the area will move in.
Try a shop vac in the morning for manual removal. Hoppers are slowest to react when they are cold. This approach will be much faster than removal by hand.
You can create a protective barrier with diatomaceous spray. Mix one cup of
diatomaceous earth with a gallon of
water and add two tablespoons of blackstrap molasses. Spray this on the plant leaves. It's an easy and low cost deterrent. It won't harm your chickens when they eat the dead hoppers. It won't stop the infestation, but it'll slow it some. It'll also increase the rate of hopper demise, which in turn will make your Nolo more effective.
Nolo and chickens are not synergistic. Nolo works when grasshoppers are infected and die. Other grasshoppers then eat the infected remains and become sick. If the chickens consume the remains first (likely), Nolo won't spread effectively.
If you are simply trying to keep the hoppers from killing your trees (meaning you won't get crops) then heat a big kettle of rhubarb and tomato leaves and let it simmer. Cool the resultant liquid and use it as a spray on the leaves. Rhubarb and tomato leaves are both insecticidal. Just be aware that they're poisonous to people too, so don't use them on anything you intend to pick for food (I suspect we're less concerned with gathering food than preventing a total demise of remaining plant life). The boiled leaves can be rubbed into the posts and on other stands the grasshoppers would be likely to occupy.
Kaolin clay is another option. Mix two cups of powdered Kaolin clay with a gallon of water and a tablespoon of mild
soap like Dr. Bonners. Spray this on leaves and you'll create a repelling coating.
It would be easy to combine the Kaolin clay treatment with the diatomaceous earth treatment and the insecticidal spray from rhubarb and tomato leaves. I'd combine the first two recipes and use rhubarb and tomato leaf solution in place of water. Add
enough liquid to facilitate easy spraying, and go to it. If it were me, this would be the approach I'd take.
My heart goes out to you. That infestation is dreadful. Still, I think there's a way to save the trees.