May be the solution could be easier.

Taking into account that you want to use a SPP-profile (a virtual serial port), you could consider to read/write this port directly.

I use QextSerialPort library ( http://code.google.com/p/qextserialport/ ) on Linux an Windows boxes, including Bluettoth SPP for GPSs.

I haven't yet tried to compile it on Maemo, but considering that it is Linux, I think it will work.

If other guys consider that this approach could work, I can try it. (No much time now, I'm fighting against telephony extesions for Symbian ).

Regards,
Àngel