Default Sense 4 calculator

My wife is a fan of the Sense 4 calculator (the one we had prior to the most recent OTA). The huge numbers were useful when you are drunk in a bar computing the tip, apparently. All the iPhone users were jealous.

So here is the question: is it possible to bring it back (following the OTA) without having to root the phone? I already have the apk from a Sense 4 ROM (Viper). Is there a way to install it?

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