First, do you even need glass panes there since they're getting blown out anyway you might as well hide them it's not like they're contributing much to the scene?
If not, you'll need to set up a separate mask for them and then composite the alpha and the windowpane maks to get what you need to replace the background.
As for the highlight burn, you'll probably need to go to corona render settings>frame buffer settings and play with highlight clamping. Search through the corona helpdocs there's an article on how that clamping works vs the camera clamping