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I haven't had a chance to play with it yet and thus have not configured it.
From a high level, you should be able to use DRAWS™ for piardopc.
You would configure the sound to use the ALSA sound channels (left or right) or install pulse audio and be able to select the left or right channel from it. See: https://github.com/nwdigitalradio/split-channels
Based on this document, you should be able to activate PTT on GPIO 12 ( -c GPIO=12) or 23 ( -c GPIO=23) depending which DIN connector you are using.
Use the DRAWS™ Manager tool to set levels, if using ALSA raw left and right. See https://www.youtube.com/watch?v=v5C3cWVVz_A
Schematic and pinout is at https://nw-digital-radio.groups.io/g/udrc/files/DRAWSTech.pdf
John D. Hays