I think this is a good idea. Especially the part that allows those who can demonstrate a higher level of responsibility, complete additional safety courses and background checks, to own these banned firearms.
Bans are generally just bans for people who follow the law. So I like these exceptions for those who are willing to “extra follow the law.”
Obviously this assumes that the exceptions will actually be given, since it’s up to your local sheriffs discretion. Could be abused.