A 3GS is easy to open and the buttons should be easy to swap IIRC. I've had microswitches that died in other electronics before and they are just too small and not worth it to repair rather than to replace.
To open a 3G or 3GS, you just have to remove the bottom screws. Some people then pry the glass off but that can cause damage. The trick is to use a good suction cup on the glass and you can actually just lift it free from the housing. There will be a bit of resistance.
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