Increasing the size of the hub/fork contact surface via modified hub end caps and fork lowers is an intriguing idea. The ROBOTS agree that single crown fork stiffness for aggressive riders is an issue that needs delving into.
A third solution to add stiffness would be be to create an oversized axle. I know new standards are almost universally hated, but hear me out: a 33% increase in diameter over the existing 15mm standard would create an axle with a diameter of roughly 19.9mm, and would yield huge dividends in stiffness. And once you were creating a new axle standard, you could add even greater stiffness by removing the admittedly handy quick release lever and instead secure the axle against rotation in the lowers with bolts that cinch the axle tight. Some might gripe, but the ROBOTS believe most humans using a 180mm fork are not in time sensitive flat change situations. In most gravity events a flat tire means the end of your run anyway.
This is a early stage rendering of what such an axle standard could look like: