@Windgate,

Unfortunately, the devices require an active Wi-Fi connection to receive any changes in settings. 

The switches do offer a soft reset meant for this situation which will simply reset the network settings for the device while keeping any other settings that you may have configured, such as the device name, room, schedules, or automations.

The soft reset is typically performed by holding the button for half as long as it takes for a factory reset of the device. This will allow the device to be seen by the Kasa App, where the app will offer to keep your settings and change the wireless network. I would recommend doing the reset one device at a time, so that you can be sure that the setup periods do not end and so that there will only be one default SSID being broadcast at a time.

  @Windgate,

Take a shot at the soft reset process if you can, it will basically be the same process but instead of being presented with the option to give the device a name, it will provide an option to use the pre-existing settings. 

If you are having issues reconnecting the devices, you may try going through the normal steps of trying to connect the device to a 2.4Ghz network, such as a guest or IoT network.

  @Windgate,

What type of cameras are you using? If you have a pan tilt, the reset button is on the inner section of the camera and may require you to manually move the camera to see it. Here's an FAQ that may better explain where the buttons can be found: Resetting a TP-Link Kasa Camera

Fortunately, that FAQ actually shows where the reset is on all Kasa cameras, including the doorbell - but you are correct, the reset for the doorbell is behind the plate.

The Wall Switch should actually have a Reset Button on the Front of the Switch below the paddle, at least for most variations. There should be two buttons that can be pressed, one is the reset that requires a hold, and the other is a restart - as wall switches cannot be restarted without flipping the breaker.