I regret that I cannot offer recipes, but I do have ideas.

A miso cookbook I once read had a recipe for squash braised in a mix of broth and miso; I think subbing the fish sauce for miso would be different, but tasty.

Non-Asian, but a place local to me used to make a wonderful vegetable lasagna with cubed butternut squash, spinach and thick white sauce, heavily flavored with rosemary. You may or may not be interested in lasagna, but it could be adapted to a vegetable casserole.