Here's a copy of the IFIXIT guide image of the power button:
[image|1054485]
While hard to see here I do believe the two pads just left and right of the wires exit point are the same connections. It's been awhile since I've worked in this series so I could be wrong here.
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See if you can solder on a few leads so you can test it out once you have the system re-assembled see if shorting the leads works. If it does you might be able to tack the connector leads to the wires (keeping the connector working).
Here's a copy of the IFIXIT guide image of the power button:
[image|1054485]
While hard to see here I do believe the two pads just left and right of the wires exit point are the same connections. It's been awhile since I've worked in this series so I could be wrong here.