No, Nooey, a hard beaker won't turn into a hard biter, his owner will be the one to do that, if you catch my drift. If he does start biting, you will be the one to stop it if it ever starts. But I don't think you have a problem here unless you make it one.
He is just exploring and testing his world and if you follow the advice you have received here, you will be happy with this bird, give him all the love you have and we will be here to help you in any way we can. Plus you will have the support of the breeder, he sounds like a good person to know.
I think in your heart you have already made your decision and it is the best one, and I back you 100%.