I would like to see a data sheet. However, based on how you described it this is my answer:
Depends on the inspector. You did not get an official answer from FIRST about your particular application. Therefore, it will be how the lead robot inspector feels about your application of the burn wire. We can't be used as a source when dealing with the inspector.
- Your application violates the intent of custom electronic circuitry <R60>. Although that does not preclude its use.
- Your application sort of violates R61 and R63.
- There is a big question about an electrical component whose design it is to become extremely hot to the point of failure would be considered safe on the parts use flow chart.
In other words, you're on thin ice. If I were you I would redesign.