I did a talk on reverse engineering AirWire at DEF CON in August, and it’s finally up on YouTube. Most of this info has been shared here, but this is a comprehensive run-through.
I watched the whole thing. Understood about half; but the end result of your work is very cool. Airwire, or something similar, is on my short list of systems to look at and having a low-cost option for accessory decoders would be great.