Some people handle their boys a lot, some turn human aggressive and some don't. Some never handle their boys, some turn human aggressive and some don't. Many are somewhere in between, some turn human aggressive, some don't. Sometimes older hens beat up on the boys, some turn human aggressive, some don't.
Is yours a reasonable plan? I think so but I can't give you guarantees one way or another with living animals.
They are still immature cockerels. They will still have a lot of maturing to do. Sometimes teenage hormonal cockerels are a pain in the butt. Sometimes they are not that bad. My suggestion is to observe what actually happens with yours and make your decisions based on what you actually see.
The way I manage this is to set goals for what I want. When one shows he does not meet my goals, whether behavioral or physical, I eliminate him. That makes it easier to judge the ones remaining. By the time I get down to the end I may have a few good choices or I may decide none are that great.
Go by what you see as opposed to letting your imagination rule.