Hi Paul,
A laudable effort, but until EVERY airborne vehicle of whatever type, with or without a human on board, is equipped with a common system, mandated by law, then I'm afraid that we're still as much at risk. I suggest that the effort ought instead to be put into developing a cheaper ADS-B and effectively lobbying to make it the law that everyone MUST have a working unit whilst airborne. Personally, until someone makes me change it, I'll still be using my Mode C transponder.
It took legislation to make the airlines fit TCAS II. It'll take the same to make us change to ABS-B.
TOO