I'm curious - does it look any different to FDev's own FXAA implementation?
Not appreciably, at least not to me in the few minutes I spent with it.
I'd wager that the whole reason it's disabled by default in the driver profile is probably because it's a copy & paste of the NVIDIA FXAA shader...no point in allowing the driver option when the game has the same thing.
You are better off trying third-party shader solutions that can apply more agressive and better optimized post-process AA than what's available via the game or AMD's or NVIDIA's drivers.
Throwing money at the probem is probably your best bet if you want guaranteed results - get a monitor with physically smaller pixels than your current monitor, and enough GPU to drive that at an acceptable framerate.
This isn't really a solution as such GPUs do not yet exist.