$40 vs free when both are legal. Hell yes, we should buy the driver.
Modifying the EDID is risky, and it's not guaranteed to work. If it does work it might cause other issues. I would rather pay $40 to have a reliable solution via a proper driver instead of a hackfix, but that's just me.
How do I get 3D with an Nvidia 3D Vision graphics card (built in)?
You enable it in the NVIDIA control panel and then enable the option in Dolphin.