Adding the Sideways Dabbabah to the Narrow Knight will achieve nothing important. The piece will be able to triangulate, but that's all there is. It's still 4-way colorbound.
However, adding the Forward and Backwards Dabbabah makes the piece 2-ways colorbound, but unable to triangulate.
Betza used the Ferz+Forward Knight (Fibnif) with success in the CwDA. The piece is as powerful as the knight, even though it's slower while moving from one wing to the other.