They cannot release it in to circulation since it is not approved by ECB.
In a monetary union, Central bank of individual nations have to give up their right to decide on specifications of legal tender.
They can not issue this coin as legal tender of 2 Euro and can not change the denomination since they are already minted.
At best, they can sell it as pattern, in card, and sell it much above the "face value " as they did for Red Cross coin. That experience should stand them in good stead and help them in pricing.
Personally, I feel that the selling price of this pattern would easily be double that coin since topic and theme has attracted international attention.
In other words, France had helped a good cause by creating a controversary and for all you know, ultimate victory may be that of Belgian mint.