We use a solderless socket that was specially designed for the CG2 wireless variety of the XBOX 360 controller.
I believe the wired version is more akin to the wireless 'matrix' version, which increases the part counts as you end up adding quad bilateral switches to the design to get it to work.
The wireless socket is the most expensive part of our modchip at $18. Not only would we have to re-tool for (and purchase several thousand of) a different socket, we'd have to redesign the entire PCBoard as well, as that too has been designed for a 'perfect fit' in a CG2 controller.
I have no plans to take on a wired XBOX 360 controller project. It would be cheaper and easier to design a modchip for PS3 controllers, or for that matter, probably easier to create a new adapter.