Disable the toggle switch and bind the the selected property to your bool without biderection. Create a custom property that contains the tag path as a string of the bool that you want to toggle and a parameter for the tag path on your popup window too. Then just put an event "OnClick" on the toggle, use the popup action , and pass your custom property to the popup's parameter. From there you can add a script binding on the "Yes" button to write to the tag specified by the tag path, and the "No" button simply closes the popup.
You will probably want to mess with the stylesheet for the toggle as by default, disabling it removes its color and changes its appearance. There's this post about changing the style of disabled objects. You can also change the pointer to something instead of the X with a custom style called "cursor: pointer"