There are almost 10 370Z/G37s that have converted from 7AT to 6MT including mine here in Taiwan. I have been driving it for almost 3yr without problem.
To answer your question, you can either swap to 6MT ECU or use your original ECU to re-flash it to the version you want.
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Current: 2015 C200 / 2018 Cayenne / 2012 370z / 2012 C250 Coupe
Gone: 2013 Cayenne / 2004 Cayenne S / 2003 SL55 AMG / 2008 C300 / 2006 350z / 2006 C280 4Matic
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