If the blue doesn't have "option" ports for WB input, could you just use that 2nd airflow input(or analog in etc), log the voltage and compare it with the WB specs? Is your WB analog out programable? Maybe you could program it in such a way to make it easy to interpret.
The Innovate WBO2 has 2 analog outputs. I use one for the PCM(disconnected the stock one) and programmed that to simulate NB. I use a relay activated by the EM2 auxilliary output to force the PCM into open loop when I want. Works well. The other goes to the EM2 and gets used for datalogging and self tuning.
Despite it's excellent capabilities, I would not recomend the EM2 unless you found one really cheap, or borrowed it to see if you could get it to work. But then my particular engine is not supported by the software and this may be the cause of some of my problems ( that and I'm learning as I go and haven't yet taken it to someone who knows what they are doing!).