I like this Neville. With his foreknowledge, he's able to start tweaking the timeline to improve things. Between an arguement his Gran will accept for getting a proper wand (that's a right proper one, too; I imagine she was impressed at his reasoning, if not his using his own wand) and his efforts to befriend and help both Harry and Hermione, it's going to alter the dynamics for first year considerably. It will be interesting to see how the universe resists his efforts and how strong the reaction will be.
Author's response
Thanks; I don't expect too many problems for the first year, because the pieces are already in place, but, going forward, the ripples are going to cause changes to things that Neville remembers, so that his future knowledge won't be as useful.
Red