Mod that provides acess to Blade of the East before the finale, w/in lore reason

[HackWithTHeJacket]

Are there any decent mods out there that add a way to gain the Blade of the East sometime before meeting the Legate in battle? Preferably in a way that doesn't break the immersion of the game. Even something like, say, creating a legion corpse dressed in Vexillaurius armor in the Deathclaw Sanctuary, along with a note saying that this runner was dispatched to bring the Legate another sword from back in Arizona.