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K+DCAN interface which could read actual voltage would not be any more expensive as it is. If it has any MCU inside, most of them have internal ADC. And external components required are two resistors for minimum design. Premium design would include one more capacitor and, depending on MCU input properties, maybe a protection diode would be needed.
Now, if interface could read actual voltage it's not difficult to pass that to ISTA+ with some additional code. However ISTA+ itself does
not even try to read voltage via Ediabas functionality so it will not work with omitec or any other thing without outside help. Only ICOM is supported for that natively in ISTA+ and it uses another asynchronous IP communication channel for that (SDP protocol, I guess the same that IToolRadar uses to display info about ICOM state in the bottom window), different from the data channel.
What my updated dll does is it multiplexes requests from ISTA and my own voltage control code into single Ediabas' command sequence going into cable driver.