I'm not aware of persons of African or African-Indian ancestry in the 2nd and 3rd Indian Home Guards. It is my understanding that those of African heritage in the 1st IHG were freed slaves that served as translators.
The 2nd and 3rd Indian Homeguard were predominately Cherokee and had sufficient English speaking tribal members that translators were not in short supply. I would suspect that those of African heritage in the Cherokee Nation (whether slaves or free Blacks) served in the 1st Kansas Colored Infantry.
There might have been African Cherokee in Drew's Regiment before it defected. Anyone out there know anything about this?