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No waiting for rain. Soap solution sits there waiting for rain, etc. Washes oil out and then it is over for the bird. Kittymomma nailed it. A night operation.
Another method would be to relocate the chooks temporarily, close up coop tightly and connect the lawnmower to a hose and pipe in carbon monoxide gas via the exhaust. Just walk out there two hrs later and toss out the dead birds. If coop is well ventilated, may not work too well tho. In that case, would require a truck or car for adequate volume. Even if they do not die, they will be so groggy that you can dispatch them easily.
What about doing a rag or pillow case over the pop door? Chooks can get in and out, but could be a lot harder for starlings. Worth a try? Put it there in AM so they will push thru it to get out, and they learn that they can do so.