This fellow is Adulphe Delegorgue, a French adventurer and explorer in South Africa in the 1840's:
I'm not so sure the hat with ostrich plumes would go so well, crawling around in the bush, but he has a very neat belt pouch, and his cape buffalo powder horn is suspended from his belt, South African style, rather than from his shoulder as was more commonly seen in North America:
Here he is again, with a couple of native companions, loading up for another shot at an elephant:
His kit looks very simple, but he was a very successful hunter so it must have been adequate. It shouldn't be too hard to cobble up a pouch like that. As for the horn, Delegorgue's buffalo powder horn appears to be one piece, with a groove around the neck for the suspension cord, but I think a lot of South African powder horns had separate tips attached. I don't know if they were made to screw off, or if they were permanently attached. These Voortrekker horns appear to have separate tips attached, and they also show the suspension cord, for hanging from the hunter's belt:
These views of Voortrekker horn butts show typical incised carving, but they also provide a little information about attachment of the suspension cord. A lot of these look as if they have a metal band around the base, with a loop or staple of some sort for the cord:
Just some more options for you to consider.
Notchy Bob