Yes to Egyptian infantry - including white uniforms - and to artillery and cavalry.

No one has offered Mahdist artillery, which might be an idea.

Also a good match to the late colonial Slade Wallace-equipped Brits would be Pathans for the North West Frontier campaigns of the 1890s.

My understanding is that such troops would use captured Egyptian Krupp guns, manned by captured Egyptians (in rags & chained!) under the command of a Dervish with a kurbash (hippo hide whip).

Does it get any more exotic?