Will Aeon Labs Z-Stick pair as secondary controller to ST for vehicle zwave presence

Continuing the discussion from Can I use an Aeons Lab Z-Stick in addition to my ST hub?:

I would like to know before purchasing a z-stick if it will pair as a secondary controller to ST. My thought is that if it does pair, if it can be powered via extra phone charger usb in vehicle to somehow use it as a z wave presence device. My house is mostly zwave, I’m not against zigbee, but i don’t want some mangled zigbee presence sensor that I have to alter to get a hardwired usb power to.

Let me know your thoughts. Certainly most interested in If zstick will pair, and If you think that this is doable.