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I've had to work with lots of flies from water traps recently and found that if I manipulate them into a decent posture while hydrated, transfer them to 90% isopropanol for a while (a day or so dries 'em out pretty well), let them air dry, and mount them on points or with adhesive to the side of a pin, I end up with usable specimens.

Though I admit: dusting and aspect /posture of fine hairs isn't important for my taxa.

The whole process is actually faster per specimen that pinning freshly collected flies. And gluing them to a pin makes them smaller in a drawer.