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Thanks Shannon! This is a clean way to implement a logic board to power converter! I have finally successfully retrieved and saved 18 values from our YSI EXO2, which itself requires a signal output adapter to transmit SDI-12, using the modular sensors library. This was done without using a logic converter and powering the EXO externally with 12V.
My initial error was not taking into account the pin interrupts for the mayfly (I first used the basic arduino sdi12 code) so I was able to send the message but that is why I was not receiving a message. For reference Arduino-SDI-12#variants-and-branches.
I have a working local header file for the YSI EXO and hope to commit the code and pull request in the next few weeks. I also found some limitations in the sdi12sensors library that need to changed to get more than 3 or 4 measurements from a sdi12 sensor. Once the sdi12sensors code is updated I would think any advanced instrument that produces many measurements via sdi-12 will be able to be used in a similar fashion as the YSI EXO header.