Use your Nikon-G lens with aperture...
Focal reducers for Micro Four Thirds cameras
Focal reducer adapter for Nikon-G lenses to micro-4/3
VILTROX EF-M2II Auto-focus AF Mount Focal Reducer Booster Adapter for Canon EF to Olympus Micro 4/3 Camera
Focal reducer adapter for Canon FD lenses to micro-4/3