Obviously we do a fusion prequel/sequel two parter and turn it into a
In the first half, the Parliament is not happy with Mal, but now they have bigger problems. And so does Mal. In his experiences he realizes that he will not find peace as long as Parliament is still in power. And with the help of his crew he discovers that there is no one better to help him understand and navigate the maze of power and how to attack Parliament than the person he most despises in the universe, the Operative. Through a series of new scenes and flashbacks (Which give us back Wash & Book, for a while) Mal realizes that Book was an operative, and that his nemesis, now in reclusion (like Book was) is the only one who can help him.
So the first of the sequels brings Mal to the realization, and Mal finds him. Their eyes meet, but not a word is said fade to black end of part one.
In the second, it picks up with the exact shot we left before, almost as though we just 'blinked.' The Operative joins Mal's crew (with all the expected edginess) and together they bring down Parliament. (Accomplishing almost single-handedly what the Browncoats could not do openly!)
To paraphrase Independence Day: "Any Questions?" "Let's Do It!"