That does sound like an improvement over the actual Hobbit movies. I'm not even joking about Oppenheimer, would do it if I were really bored. Might be a great movie if it were simply in order.
I highly suspect someone has already made a fan edit of Oppenheimer like you've described. I searched for a few moments and found 3 already and one already describes re-cutting it in chronological order, among many other changes. Always surprises me how much effort and passion people put into fan edits. It's a facinating scene in itself with how many edits exist out there.