The more interesting thing would be how the Somali ethnic regions would subdivide. It is unknown.
This is what would be interesting to study. I would look at the Eurasian component and if it has a cline from north to south. My hypothesis is that it declines the further south you go, while the Somali component increased. There are of course exceptions like the Banadiris, Bantu, and the omotic Jiddu; but it should hold true for the most part.
Somalis look homogenous because we are in a diverse neighborhood. We are a very diverse ethnic group if you use the same parameters used by the study above.