Thank you Vilas.
I am well aware of the danger of pulling CBs that are not in the Computer Reset section of the QRH. However it would be nice to know whether or not it is possible to use the outer wing tank fuel rather than running out in the event of DC1+2 fault.
I suspect it is not possible otherwise AI would have inserted it as a procedure.
So the answer to your question is - no, it is not an idle query but more of a technical exploration of the A320 so that I can answer the question when posed to me in the sim - where I live!
mcdhu