You stated: The overwhelming majority (of CSA Blacks) served unofficially in supporting roles as teamsters, cooks, servants, laborers, and the like
So then soldiers in WWII or any other war who served in similar functions are to be considered on a lower rung of honor then those who fought in combat?
Soldiers win WWII or any other war who filled those roles were, at the end of the day, soldiers. Enlisted as such, treated as such, and paid as such. Blacks who filled these roles for the rebel army had no legal status and were not considered soldiers at all. Not until 1863, when blacks were authorized to be enlisted as musicians, or 1864, when blacks were authorized to be enlisted as laborers working on fortifications and military construction, did they achieve any official standing. And, of course, March 1865 when they were finally authorized as combat soldiers.