No. You can’t use any power adapter for the V3. The cord that comes with the Lamp Socket is a special Data and Power cord that has to be used between the Lamp Socket and the cam. The V3 gets power from the Lamp Socket to run while communicating with the Lamp Socket thru the Data Link.
No. The Wyze V3 and the Extension USB are both weather resistant rated so long as you have the rubber boot on the USB connection to the V3. The only item not weather resistant rated is the V3 Power Adapter that plugs into the wall. Since that is inside, there shouldn’t be any issues as long as the USB cord connection isn’t in an excessively wet environment.
As long as the socket cover is Weather Resistant rated with a rubber water seal and will fully close when the power adapter is plugged in, I wouldn’t suspect any issues.
I would suspect because of the technology available at the time they were created. The WCO was conceived when batteries and WiFi chip sets were not as good as they are today. It is also a much smaller cam than the BCP, therefore much smaller batteries. The way the WCO communicates with the Base Station does not require a constant WiFi connection and uses less power to conserve battery life. It doesn’t have a WiFi transceiver chip in it needing constant power. They were able to overcome that limitation with the BCP using more advanced components and much larger batteries. The V3 and all other Wyze AC powered cams are powered 100% of the time so constant WiFi isn’t an issue to maintain. It has a WiFi transceiver and antenna in it that is powered 100% of the time, even when it is off.