I think you missed the boat on one thing here, imagine the interplay that would happen IF Hermione had also journeyed with harry here.
Maybe a divergent story in the future might give you a new direction to follow.
dennisud
Author's response
To be honest, I hadn't considered having another character, such as Hermione, come through with Harry. I may have to write another story exploring this possibility. I will admit that the characters in the books will show up eventually, but it will be a while before they make appearances aside from memories and allusions.
Rob