Because the United States did not sign the 1968 convention, let alone ratify it, you can not get a 1968 license on the basis of a US license. That your license has been obtained in exchange for a French license does not change that.
Therefore, you can only obtain a 1968 license on the basis of your French license. In addition, such a license is only valid if it is accompanied by your French license. So, as long as your French license is impounded at the French consulate, you will not be able to obtain a 1968 license.
If and how the French authorities would be willing to issue you a permit, it depends on other circumstances, in the first place if "normal residence" In France.