By way of update, I watched the BeatSonic install video figuring I could at the very least learn how to take the dash apart (which I did).
Anyway, it seems a lot of the harness' and connectors shown in their video resonate with what I have in the box from China - Supports my generalist attitude of "they're all built in the same place anyway" (famous last words).
Has filled me with a bit more confidence and the desire to get the install done.
But, its VERY cold right now so I am happy to opt for the DIY until we get a clear weekend closer to 10 degrees 🙂