This is not a answer, but rather a directions to look.
As I remember, Apple moved WiFi API's around (from one framework to another) several times. So, most likely this path ("/System/Library/SystemConfiguration/WiFiManager.bundle/WiFiManager") is obsolete.
You should be able to use dlopen and get a handle even on non jailbroken iOS device. So, this is not a problem. However, I am not sure whether these API's which you mentioned are not protected by entitlement.
If you have iOS 6 simulator, I would recommend to go there and try to grepr and find where these API's live.
BTW. Look at this question. He claims that his code works on iOS 6 - Iphone 802.11 Scan