Does the iPad 3/4 charger use a standard C7/C8 interface?
Solution 1:
I happen to have a C8 plug from my PS Vita charger, and my iPad (3rd gen) charger here. I plugged them into each other, and plugged in my iPhone. Sure enough, it started charging my phone.
So yes, this does work fine. C8 plugs will plug into the iPad 3 chargers.