Have you tried a scarecrow made out of some of your old clothes?
I tried wind chimes, aluminum foil pans hung up to blow in the wind, feeding them just outside the chufa patch, taking a 22 and shooting it in their general direction to scare off (not at them; calm down), etc. None of that helped.
Never tried a scare crow.
I’ve heard of guys finding stray puppies and taking them to patch and feeding them there until the chufa gets big enough turkeys won’t mess with it. Theory is the dog would keep the turkeys away. I’ve never done it.
Like PCP said, once they get started, they are like a tiger with a taste for human flesh...doesn’t seem like anything can stop them