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Will your hens get broody? If so, you could get some fertile eggs and have them hatch chicks and just keep one of the males as his replacement. Being raised as part of his flock it is more likely for him to accept his "son" and for the growing "son" to respect his "father".

Just looking at cracked eggs to evaluate his fertility is not enough. As @ChocolateMouse already suggested, you should incubate some of the eggs for at least one week to see if they develop. How old are these hens? Were they adults already when he joined them as a chick?