The DGAC (French CAA ) issued a NOTAM last year requiring A/C that were able to listen on 121.5. This is to stop the number of intercepts that have occured when A/C cross FIR boundaries without radio contact. If commanders do enter French airspace without radio contact and they are intercepted the French have reserved the right to charge the commander with the costs of the interception. This is one of the reasons that CAT now are complaining.
I sugest the following solution.
PF listens to ATC and 121.5 and PNF only ATC or visa versa.