When any meter is pointed at the subject from the camera position, even an incident meter, it is being used to measure reflected light.
To measure incidental light any meter must be in the same light as the subject and be pointed at the camera position.
On occasion, when using my Nikons, I will walk up to my subject then turn back toward my camera position and meter the scene with the camera or the sky in that direction. In this case I'm using my cameras "reflective meter" as an "incident meter."
This is far from perfect because of the various patterns a camera's meter uses but if you have practiced and know what to expect it is very workable.