Where does it state I cannot have a supply and service on the same PR if I do not violate micro purchase thresholds?
This response is based on the information provided. We suggest you discuss with your contracting team, program manager and/or legal department as appropriate.
What you would need to support is whether the parts are essential to the completion of the task. It appears they are.
This is a discussion you need to have with the Government Purchase Card (GPC) monitor. Interpretations may vary from service to service and from GPC monitor to monitor.