The kudu that G&G uses is from the now defunct Pebody tannery in Northampton.
The only other maker I know that has access to this particular leather (antelope), with this particular and specific grain pattern, in this particular tannage, is Antonio Meccariello.
There is no further ability to acquire this leather unless you already have it on hand.
Carmina's "kudu" is totally different.
That being said, I don't think you can make an elegant pair of dress shoes with this leather. Whatever the makeup, it will be casual, no doubt about it.
Then again, I suppose different people have very different definitions of "elegant".