Extra feeding to attract Swiftlets to a new farm? Well it is a good idea, where there is food the will be Swiftlets.
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The whole idea is to attract Swiftlets into farms especially new farms. Swiftletl always fly to area where food is abundantly. Having a place that has lots of insects would surely attract Swiftlets.
There are few ways make insects especially flies. Some of the common ones are putting fruits in farm and let it rot or using wheat and oat mixing with sugars, yeast....etc and many more techniques.
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The question is not how many flies it could produce or how many Swiftlets the feeding could attract. It is how many Swiftlets your farm could attract and how many of them would stay and make nest.
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No points of having food around or in your farm where Swiftlets come and eat later go back to their respective farms to stay and make nest. Your farm has become a restaurant for Swiftlets but not a Hotel. What we want is a good Hotel for them to stay and make nest. As for food they can go anywhere to look for it as they had been doing it.
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The conclusion is to have a good farm that has a good micro with this even without extra feeding you would see nests in your farm. So micro is much more important than extra feeding.
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I would be very much happy if a shabby farm next to mine everyday provides flies for swiftlets. He could attract all swiflets around to his farm for food and when the evening comes all Swiftlets will fly to farm that have good micro. So as far as Swiftlets concerned my farm got all the free publicity.
Secondly rotten fruits also attract predator especially "Musang". Once they have got into your farm all Swiflets will fly away and never come back as the odor from "Musang" really scare them.
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Good Luck!