They're not really kekkei Genkai, they require the kekkei Genkai to learn, but after that point they don't really require the kekkei Genkai once mastery over them is gained. Hinata uses TLF without the Byakugan active as an example.Gentle fist is just a fighting style, not KKG. But I think some of the Gentle Fist's techniques like Rotation, Airpalm, Lion Fists are KKG.
The fighting style itself is not a KKG, but it's techniques are.