I know it's a long shot, but looking over the install manual for the $385 virtual key module for the new Z, which allows you to use your smartphone as the key. The wireless module connects to the 'D-OPT' connector. Does such a connector exist on the 370Z?
https://www.nissan-techinfo.com/asis.../X/G/1XG39.PDF
https://www.tascaparts.com/oem-parts...key-t99k16ta01