I'm sure that it can be done, but considering the fact that Apple engineers their products to be fairly tamper proof to begin with, not to mention the fact that the circuitry traces will be minute, I can pretty much assure that this would pose a challage to somebody who is very good with a soldering iron.
I don't mean to discourage you further, but I would not be suprised if the surface mount jack that Apple uses has a wierd/nonstandard pinout arrangement.
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