How about a keyboard shortcut to 'go to' the image in the Book Browser (e.g shift+alt+i) so that its Open With could be used. By 'go to' I mean give keyboard focus to the image file in the BB so that user can use the keyboard (e.g. shift+F10) to pop the image files context menu, and then select Open With the required image editor.
Not sure how that that would work with mouse clicking or on Linux/MacOS.
BR
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