Bottom line: Consider using Informational;Subline Items (Informational SLINs)

Information SLINs can accommodate different types of funding for a particular CLIN (e.g.; different appropriations, different program elements, different funding agencies). This sounds like a remedy to your use case.

Your Financial Management & Comptroller officials are the necessary advisors regarding which appropriation is appropriate to use for simulator contracts because such a decision requires knowledge of the applicable fiscal year budget authorization and, if any, USAF unique budget policies.

Please refer to Reference: DFARS PGI 204.7103  for more detail. 
https://www.acq.osd.mil/dpap/dars/pgi/pgi_htm/current/pgi204_71.htm