When I was in France the Weekly markets had a veriaty of game birds for sale including hens and ducks and even geese. If the quail eggs are over 10 - 15 days old, they'd be dicey to hatch. Why not buy a few then have your own eggs for hatching?
Perhaps if you only kept hens not roosters? Have you appealed to them? Maybe the ducks are noisy? I know ducks can be real pain and they quack very loudly. Hope all goes well for you, sure hate to get rid of the brood