Are you saying that the Arduino would only be able to talk to the PC through USB and not bluesmirf? What good is the bluesmirf then?
No. You will be able to talk to the PC, but, and correct me if I'm wrong here, you won't be able to transfer your program from the IDE to the arduino using the bluesmirf - that will be done using USB.
Also what do you mean by a "one-off"?
How many are you going to make? If only one, then its a one-off.
Regards,
Mike