I told him my initial plan was to use a homemade set of knock headphones. Apparently they use a set of electronic knock headphones themselves when they tune, as it is easier to decipher what is and is not knock.
I think for me the right move at this time is to skip the knock module and use the whisper2000 homemade knock headphones to listen for knock. As long as I keep the same grade of fuel (and don't ever get a bad tank of gas), I should be fine. Seems that is the consensus among megasquirt users online as well.