GetRadiosAsync won't list Bluetooth radios if bthserv isn't running

The GetRadiosAsync WinRT method is documented to return a collection of the communication radios on the system. I discovered on Stack Overflow while researching for this answer that it will not find any Bluetooth radios if the Bluetooth Support Service (bthserv) is not running. If the service is running, the function will successfully find all radios, even those that are disabled. That service has a trigger to start under some circumstance that I can't determine exactly (an RPC event of some kind), but my script has to rely on starting it through the normal channels.