About the 'BI hacking'
There is no interface for picking certain equipments to socket. The ArtisanOu is a simple interactive NPC, like a conductress for example. You select options in a dialogue window. Each time you select an option, it send a single number to let the server know you chose that option.
He doesn't give options for "boot" or "head", or anything like that. Its quite linear. He asks, "Do you want me to socket your left hand weapon"
You either click yes or no. The client sends a 0 of a -1. 0 means you picked yes.
Now, the server handles everything from here. It checks you have the required dragonballs, and checks you have a weapon on your left hand, and how many sockets it already has.
Unless you can trick the server into thinking you have a boot in your left hand, a socketing method via ArtisanOu is completely out of the question.
Unfortunately, its impossible to trick the server into thinking you have equipped a boot, because you do not specify where you equip something. The server decides that.