Before you try that "not historically accurate" nonsense, consider every other aspect of the game. Then ask yourself what possible grounds could you have for deeming dual wielded weapons less "realistic" or "accurate" than leaping fully plated pike pokers from 3 inches, disorganized and nonsensical troops and battles, and all other manner of things that are what they are because this game is what it is, a game.
Now ask yourself, how freaking awesome would it be with dual wielded weapons, while I ask myself isn't this super possible with WSE? I imagine just making it exactly like having another 1her in the other hand controlled with the other mouse button would be all you need. No blocking, one swing at a time, maybe some sort of damage penalty for dual wielding like in most other games of this sort to negate possible op-ness, whatever other such nerfs and balances become necessary from observation like the rest of the mod. I probably personally wouldn't do it, at least not as a main, but I know there are plenty of crpg-ers who would.
If there is a legitimate argument against it, I'd love to hear it.
