Batch Replace wavs to mp3s in Unity Project?

Is there a more intelligent way to replace all .wav audio with .mp3 audio without doing it 1by1?

I already have a bunch of wavs imported and working but the build is insanely large and i want to try mp3s to lower the size.
I already have mp3s prepared just wandering is there a script that says unity search and replace all .wav with .mp3 in the same folder structure and same naming.

Please Help a Noob.

I use Audacity.

http://manual.audacityteam.org/man/Chains_-_for_batch_processing_and_effects_automation