We must take note that DF has an essentially Western martial tradition, relying on heavy armor and grappling, as well as armor counterweapons such as warhammers and war picks to defeat armored opponents.
The one martial tradition I know that effectively used dual weapons (the Arnis style that developed in Southeast Asia under Spanish colonial rule), and it worked for several reasons that are inimical to DF's martial tradition:
First, the natives needed weapons that could be concealed or were otherwise innocuous - bolos, which were essentially lighter machetes (or the curved kris swords, in the Muslim-ruled region in the south where concealment was not an issue).
Second, neither the natives nor the constabulary wore armor, as this was well past the time armor had become defunct. In addition, any armor worn in the islands before was made of wood or leather.
Third, the style itself did not depend on armor penetration, severing limbs, or anything the Western tradition relies on. Rather, the style focused on inflicting shallow slashing wounds and rapping the opponent with the handle of the machete/pommel of the sword, eventually causing exhaustion and allowing the fighter to deliver the coup de grace. Armor penetration would have been impossible in any case due to the nature of the weapons used and the lack of strength behind the blows.
So, yeah.