Here’s an idea:
Some insightful peasant girl comes to the realization that governmental authority and the legitimate use of force can only come from the consent of the people and not some racist idea of superior royal blood. As her realization and theory of governance grow during a trek to the capitol city, fraught with dangers from the as yet not quite civilized hinter lands, to see the king and discuss the nature of his legitimacy, we see the the true nature of Aragorn become visible as he has people arbitrarily arrested, detained and tortured, as he imposes ruinous taxes while stocking up on gold for his coffers, and as he engages in a series of brutal political assassinations to solidify his iron-fisted grip on the land.
As news of the king’s true nature spreads across the countryside, and as the the girl contemplates and sharpens her theory, stopping at numerous villages to hone her thoughts on the whet stone of the home-spun wisdom of village elders and leaders, her revolutionary ideas become a powerful populist movement, invigorating and inspiring the peasants to throw off the shackles of their truly illegitimate monarchy. Insurrection is well nigh unavoidable as she is propelled, quite against her will, into the position of leading a full scale revolt.
As the war begins, we see the revolt beseiged on two sides: Aragorn has made a pact with the Dark Lord! Indeed, a true foe of consentual governance, the Dark Lord has become Aragorn’s ally in the fight against individual rights and political representation. With Aragorn’s army as the hammer and the Dark Lord’s army as the anvil, Gandolf acts as the tongs holding the beseiged girl and her beleaguerd peasant army in place to be crushed by a truly cruel and wicked alliance.
But wait! The new Dark Wizard has arisen! Calling himself Payne (I’ve never been good with names), the Dark Wizard engineers the escape of the girl and her army. “But why? Why? What do you have planned for us?!” She asks him in exhausted desperation.
“My dear,” he replies calmly, “Who do you think gave me the title of Dark Wizard?” Her confusion prompts him to have his guards bring forth a captured captain of Aragorn’s army. Under a spell of truth-telling the captain informs Payne and the girl of the movements of Aragorn’s army and the army of the White Lord. The realization hits her like the fist of a mountain troll. She collapses to the ground.
“It’s true,” she cries in barely audable tones. “It’s true. The Sauron wasn’t the Dark Lord because he was evil, he was the Dark Lord because he opposed the king!” She breaks down into tears, and the Dark Wizard cries with her, being so moved by the tragedy of her realization. But it is a triumph as well! Inspired by the truth, she leads her army to victory through a series of daring and dangerous battles. The king’s family and the White Lord are sent into exile with the corrupt elves, and rapproachement and trade obtain between humans and their closest ally: the orcs.