You could add a “Glue to + Cut Opening” component (say “stamp”) to each board where needed for detailed view. This would mean far less geometry than using 3D text.
The “stamp” component would be on a different layer and this layer would only be active in detailed scenes.
Keep in mind that the opening and its replacing image only shows properly when used on top level faces. This is sort of a bug that was discussed recently. In your case, using groups and components you would need to work with some workaround. I mentioned one in the other thread.
see: Cutting components leave holes after their layers are made invisible - #6 by Box
Or you leave the “stamp”'s layer on in all scenes. Then the bug mentioned isn’t an issue.