I don't know anything about Shawili-music.
According to Faugus it's Guvano who created that sound when started to work on the song Mokolo Nako Kufa. The song was released in 1966. Faugus made a book about his career "Les coulisses de la musique congolaise" about all the secrets and things who were going on behind the scenes when he was with Tabu Ley.