Ace, this is NOT debatable. To set up any Motorola radio to scan trunking without authorized system key access requires UNAUTHORIZED system key access which is technically illegal. There is no LEGAL way to do it.
Not via lab, not via depot, not via FTR hacks, not even with a hand crafted hex edited system key. All illegal.
You could argue that point but hand crafted system keys will be a losing point for the defendant in a court case.
My history with this topic spans back well into the late 80s. I've had those "learning experiences" but fortunately, never had a problem,
primarily because I did my early experimentation with a system that was at the ragged edge of reception range. It might have heard a mobile radio that was trying to affiliate, but not a 3 watt portable. (About 75 miles distance.)
Get a BK radio that allows TRUE RX only operation in trunking. Nice of BK to provide that capability. Or get a Harris radio,
which also allows true RX only trunking operation, but there's still an obstacle or two to overcome. Nonetheless, true RX
only operation IS supported by Harris.