Please create a new visual identifier for missing glyphs rather than using the same pink color that indicates 'missing font'. I have just answered for the 3rd time a client's question why "The text is all in pink boxes but the Find Font dialog says there's no missing font, how can this be?!" Typically this happens when Western-language documents are translated to an Asian or Cyrillic language by pasting in the supplied translation. If the designer is doing the pasting themselves, and if they're experienced enough, they can usually figure it out. But if the translation company does it and then sends back the InDesign file, it causes confusion.

It's bad UI design to use the same indicator color to mean two different things. Making it a different color would avoid this confusion.