your best bet would be getting a wifi-only kindle keyboard and swapping the screens. Even if the 3G modems of Touch and Keyboard were compatible, it wouldn't give you internet browsing while on 3G. Moreover wifi-only models didn't have a connector soldered to them (I'm speaking about k3s) so you couldn't get a wifi model to pick up 3g, I don't know what would be the case with the touch but I suspect to be the same.
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