I'm currently playing in a 3.5 D&D campaign which is designed to be inherently ridiculous and over-the-top. To this end, I want to stat out 8-Bit Theater style swordchucks for my character to dual-wield, like Fighter vs. Kary. My current idea is to have them act like a two-bladed sword, with the option of wielding it in one hand. One-handed, it acts as a longsword that grants an extra attack during a full attack action, but all attacks are at -2, and on a miss you roll an attack with it against yourself.
Does this seem balanced, and if not, can anyone think of a better way?