chooksforlife gave the most excellent and spot on answer.
Cull him- please do not "re-home", IMO that is dumping one's own problem on someone else.
There are plenty of well mannered roosters who need a new home. Well mannered roosters are infinitely more pleasurable to have around than "so very protective" roosters.
Your hens will soon forget that roo, they do not have long memories or permanent bonds.
I agree you should not be aloud to re home ANY animal you know to have serious behaviour problems
Cat and dog rescue centres will always put down animals that might attack people unless they can find the right
Owner with the knowledge to care for them,
Its very sad when you've had him for two years but I think you have been very lucky not to be seriously injured
My this cockerel