Again, I think it would be better to let the mother guinea take care of raising the keets. She can do a fine job on her own with the help of her males. They aren't as likely to accept the keets as their own if they don't raise them themselves, and the keets will be better off. Much better to let them reproduce on their own if at all possible. If you try chasing the female guinea and steal her babies I think it wouldn't be that great for your relationship.
People on here do talk about taking the eggs or taking the keets, but it's quite clear that you'll have trouble integrating the babies if you do that. Many of them take eggs and hatch the keets for sale, not for return to their own flock.
I am going to sound contrary to you, I would never let the mother guinea raise the keets in the wild/ real world. I would lock them inside a shed/brooder so she cannot drag them through the dew or rain. Guineas are poor mothers.
I have never had a problem getting keets I raised by hand to integrate into the flock. The old guineas are surrounding the brooder pen and talking with the new members before I release them. They welcome the newbies into the flock.