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Sure you could rip out a Touch ID button and the innards that connect the button but without the A7 you're onto plums.

Two words: Secure Enclave.
 
if you swap the shell what's the difference between that and a 5s setup with a 5C shell? :rolleyes:
 
Theoretically I suppose the shell doesn't matter. However you have to own a 5S and have a 5C case. Then it begs the question, why? But that is a topic for another thread.
 
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