If you use a bluetooth reciever which has a 3.5mm output port, you could use a hardware 3.5mm "Y" cable splitter. I don't know if this would help in your situation, but it is a suggestion.....
I have a bluetooth A2DP receiver that would work for this situation I have described which I bought Here (http://cgi.ebay.com/Slim-Bluetooth-S...3A1%7C294%3A50)

Hope this idea will work for you