If the glass is smooth, security film may be an option.
Or replace the glass with a laminated pane.
Is it evident that you actually have a thumbturn?
I hadn’t heard of security film, interesting. Yes, you can see the thumbturn through the glass.
We got security glass (I believe laminated with film) to go on the outside of the leaded lights. I imagine you'd have more options for installers of that.
@Sharkstar started
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If the glass is smooth, security film may be an option.
Or replace the glass with a laminated pane.
Is it evident that you actually have a thumbturn?