I don't think it would be terribly hard. The keyboards are discrete components (if they're anything like Pismo or iBook keyboards, you can undo the latches in the FKey row, lift, pull the plug, and replace with a new one), and I don't think there's much difference between the two new keyboards except power drain.
There's the ambient light sensor, but that's on the keyboard, right? No different connections to the motherboard.
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