When I read carefully between the lines I think that Kai think like this. And really frankly said it was one of the reasons that I don't bid when it was listed by ebay. But in the meantime and looking close to your pictures I am now sure that neither the unusual hilt nor the scabbard mouth and foot are very recent additions, the signs of real use are clear visible. I think that minimum the hilt is tribal work maybe because the original was broken.
I would hesitate to remove the hilt and scabbard mounts only because they don't fit the norm.