I admire your noble quest but unfortunately, you're fighting a losing battle. I would even go so far as saying anything below Mudug is pretty much bantu territory now.
Bantus technically aren't found in Mudug, Galguduud, Gedo and Bakool (4)
They are quite minor in two other regions,
Hiraan and Lower Jubba (They live only in Jammame district)
That leaves out
only four regions.....
The two Shabelles, Middle Jubba & Bay which they heavily inhabit.
Even if they are a gigantic 50 percent (One in Two individuals) of those 4 major regions population-wise they still wouldn't technically make even 15% of the population overall.
Anyway you're right overall though, Anything bellow Mudug/Galguduud is uncertain territory lol
This is why Somaliland and if possible Puntland need to be independent. It wouldn't be so bad because no matter what happens the Somali race would then be safe.
It wouldn't be so bad if my calculations are right. Two countries (2) and a south where ethnic Somalis are 75% of the population. We also still have Djibouti (Afar cunts are technically just weird Somalis to me

).
To be honest what we need is just time. In time whole genome sequencing will be cheap. Just few weeks ago "Illumina" announced that they can now sequence the full human genome at just $1000. In a few years its going to get so cheap that I think everyone will have their genome sequenced and will know his ancestry profile. In the future before you marry a person you'll probably even already know his or her's full genetic profile for example. The future seems exciting.