Hello wyowill,
The following code selects disabled cameras and also filters the images in the Photos pane, leaving only enabled cameras in the pane.
chunk = Metashape.app.document.chunk
enabled = [camera for camera in chunk.cameras if camera.enabled]
disabled = [camera for camera in chunk.cameras if not camera.enabled]
for camera in disabled:
camera.selected = True
Metashape.app.photos_pane.setFilter(enabled)