Hi Peter,
If you need MIDI (green/editable) regions there are some free "Hammond" soundfonts (sf2) to download on the net.
I can't tell you how good they sound, though...
I
think this is the one I constantly use (it's the same name and size) and someone I trust said that the sound is really nice. (Maybe I've changed something? All options are de-selected...)
http://www.sf2midi.com/soundfonts/file-detail/organ-hammond-b3--2-943kb--sf2-244 3.html
You put it in (User)/Library/Audio/Sounds/Banks/
And access it through the DLSMusicDevice
HTH
Ava Tar
PS. If you download it; please let me know what you think of the sound...