Welcome to the forum @wyse1
As you have identified, the Wyze Floodlight requires constant power to operate. Adding a battery backup would have greatly increased the price point for the device I am sure.
There is a wishlist item for this, but it is marked as “Probably Not”.
And Another for a simple button marked “Maybe Later”.
There are a few ways to achieve turning the light on and off by “flicking” a different switch.
You could make a shortcut Rule in the Wyze App to turn the light on and off.
You could use a Wyze Switch and apply rules for the “Additional” rules Double Tap, Triple Tap or press and hold to turn the light on and off.
And there are ways to get creative with the Wyze Plug and Alexa Routines.
Hope this helps.