Get out of AFOs?

Welcome.

I reckon, from what you wrote, that my approach to getting out of AFOs would be more IVIG more often and see what happens.

No matter the treatment method, I would unceasingly seek more aggressive treatment along with a second and even third diagnosis.

Concurrently, do what you can to attempt to make those muscles work. Reliable EMG/NCV testing by a neuromuscular specialist facility will likely determine if improvement is possible.

good luck.