The elm327 Bluetooth dongle that we use with the torque app to connect to the OBD2 port has a facility to measure and report the battery voltage measured at the adapter (as well as the one measured at the ecu), I just re-purposed it to measure the ESC voltage by connecting the input to the ESC voltmeter to the dongle and reconfiguring the circuit slightly as it wasn't originally designed to measure 30 volts.
Then I created a custom PID in the torque app with an appropriate scalar and voila one ESC display on your phone or tablet.
I use the appradio unchained reloaded to get the torque app displayed on my Pioneer headunit.
What we need now is for Shiv and his team to provide this facility using the PROceed ecu and to output the data with a custom PID onto the car's canbus, then we could get the same functionality that I have shown without having to modify the bluetooth dongle.
If you need any specific details, then just ask
Josh