We too kept a horrible first rooster too long, and while nobody was injured, we learned! I agree that raising some chicks in spring might get you a nice one, only if you remove any that turn into jerks.
Rehoming this guy should only be to someone who will eat him!
Human aggression is genetic, and not easily managed when his little brain is fixed on this set of behaviors. There are so many excuses for this, but this is not really fixable, and is dangerous for any person who comes in contact with him.
I do hope you have very good liability insurance! And at least in the USA, chickens are livestock, so it needs to be a farm or farm estate policy not homeowners.
Someone scarred for life, or loosing an eye, won't be a good thing!
Here we always have roosters, and cockerels, and enjoy what they bring to the flock. Anyone who injures a pullet or hen, or who thinks bad thoughts towards people, gets to live, here or any where else.
This is a learning experience for your family, seeing behaviors before the actual attacks, so you can identify bad behaviors in your next cockerels before injuries occur.
Sorry you are going through this, it's part of the whole 'chicken experience', that maybe nobody mentions.
Mary