Ian, that could work on a small project, but this is a 39-unit building with hundreds of windows.
For the time being, I've taken the image out of the schedule. Instead, I created a single wall (on a separate project Story I use for miscellaneous stuff) in which I've put one instance of each window. I then show a plan view of this wall (with markers on) and an elevation view right below the window schedule.
Not a bad workaround, but I'd rather have the windows show correctly in the schedule itself.