I hadn't considered the Carwings subscription issue, in that its provided free with my 3 year lease. I'm sure a simple workaround would suffice. Nonetheless, I think its probably just a pretty simple and minor firmware upgrade to the onboard nav-system that may enable a wifi interface, using a 3rd party USB-wifi antenna.
Even so and given the risks, how much security is needed to activate a charge timer, or climate control?... Seriously, this isn't as if we're enabling some form of identity theft, or nuclear reaction. Maybe security is a major concern in some areas, but where I live in the PNW, I could care less, one way another, about my Carwing's telemetry being breached. Why would it matter anyway?
I'm guessing the Bluetooth licensing agreement with Nissan may possibly prohibiting the implementation of a more efficient and practical wifi alternative. As such, if there were a wifi option, Bluetooth might otherwise become an obsolete technology.