I think there's a big chance it would stick to the glass and come away when you peel it of, also it's such small dimensions that getting in there to place and remove the glass could be problematic, but I may try it at some point.
Maybe a better solution would be a + of very fine wire as that would narrow the aperture, but still look like a windows frame.
Maybe a better solution would be a + of very fine wire as that would narrow the aperture, but still look like a windows frame.
Happily collecting things all my life...