The Spear Dancing Style chain of feats (Specifically Spear Dancing Style itself), allows the use of any spear or polearm as a double weapon.
If you chose a one-handed weapon, such as the Trident, Short Spear or Sibat, could you then wield one spear in each hand and use Spear Dancing Style with both? (effectively quad-wielding)
Obviously something like the Fighter Advanced Weapon Training Effortless Dual-Wielding or similar would be warranted.