My agency believes that special characters are a bad thing (since there were compatibility problems between Mac and Windows in the (ancient) past). So rather than submitting pictures with keywords, titles and so on with "Einstürzende Neubauten" I have to submit "Einstuerzende Neubauten". I do not want to ruin my database but rather have a postprocessing script or plugin that replaces "ü" by "ue", for example. Is there something like this? Some call to exiftool?
Edit: I forgot to mention that I am using Lightroom. So there may be plugins that have such functionality already. Metadata Wrangler is quite good, but I cannot figure out a way to replace patterns with it.