I'm sorry, Owlready has been developed for Python 3 from the beginning. Converting it to Python 2 would be a difficult task.
Maybe a solution is to separate your program in two parts, one dealing with ontologies in Python 3 and the other with network in Python 2.
Another solution would be to port the bluetooth socket module to Python 3; tools like 2to3 and six could be usefull.
You may also be interested by this link: http://blog.kevindoran.co/bluetooth-programming-with-python-3/