This response is based on the information provided.  We suggest you discuss with your contracting team, program manager and/or legal department as appropriate. 

You are invoking FAR provisions 52.214-34 & 52.214-35 from which we infer a sealed bid acquisition.  We searched the FAR/DFARS/DFARS PGI and WAWF but found no specific language requiring payment in U.S. dollars.  We suggest a Special Requirements clause (Section H) or, if using a modified contract format, the continuation page.