I would second this. If you can put in time I believe that you may be able to salvage the situation. You should always consider modification of your and the roosters relationship and behaviors.You may want it to be a discussion about rehoming a rooster, but what the OP has asked for is advice on what to do about what they percieve at a threatening rooster.
One of the options offered is rehoming. Another of the options offered is killing him and eating him. Both possible options.
I'm suggesting there may just be an alternative where the keeper learns something about why the rooster is threatening and what she could do to ease the situation.
I can't see why you should have a problem with that.
I add that you need to consider the state of your flock. Do you care about their relationships with each other. Be assured that they have bonds and the flock will react to any changes that are made, positive and negative. Also, what is your relationship with the flock and what do you want it to be? All of this should be considered before any action is taken.