Just a response from someone equally interested in a solution. I'm trying to set up a bluetooth keyboard (Freedom Pro) with my gsm Hero running the 1.5 based MCR 3.2. Available drivers (Freedom's own, BlueInput & KeyPro) should work with 1.5, but HTC devices, especially the Hero, seem to be lacking something that is present in most 1.5 builds.
Investigating, I find the same issue of no route to device, because there is no known device. AIUI when bluetooth is turned on hciattach is used to establish a link to the hardware. At that point an hciconfig should list the hci0 device as present but down. However I find this list remains empty at all times.