I don’t think you can turn the camera on remotely and then put it into plug-in mode.
If the user can manually put the camera into plug-in mode, you should be able to put the plug-in into the loop you describe and have it check for the image and then take the dual-fisheye. You can then send the image to another source using Wi-Fi, BLE, or a cable.
BTW, I got the Ethernet working with a cheap $14 adapter. However, I think the battery is still draining. I have not done a long-term test yet. I’m also not taking a dual-fisheye picture with this implementation.