You have tried light-painting, you have tried pinhole photography. Have you ever used pinhole to do light-painting? Yes, it can be done. Instead of a torch light try a normal flash. For this image of a rose, a flashlight (guide 18 strength) was fired 30 times from a 20 cm distance. Be aware of the direction of the light to emphasize contours and highlights as you would do in light-painting.
Camera: Chamaeleon Panorama 6×12 / 6×6 – Serial #122 with Skink Pinhole Pancake insert
Light source: pinhole flash light painting
Flash: guide 18
Film: Ilford PAN F Plus