melkorjunior
Super Freak
It was someone else who thought of it in the movie section sometime last year but yeah, just seems so obvious now. Have it that using the Infinity stones necessitates or triggers the full Hulk to re-emerge. Then switch out Captain Marvel for Hulk in the Thanos fight, not like you'd be entirely depriving Captain Marvel of her hero moment - she had a great entrance to the battle when she obliterated Thano's ship. Then you could still have Thanos use the power stone on Hulk. The rest of the final battle plays out as it does in the movie.
When they need to return the Infinity Stones at the end have regular Banner back to operate the time machine.
The problem with this idea is it negates all of Banner's character development. His story from Ragnarok through Endgame was meant to be a complete character arc. Do I miss the old Hulk too? Yes. But going backward does a disservice to the characters and turns the movies into fan service.