Someone wrote a plugin just for this a few years ago:
This was for Picard 1.4 though so it will probably not work with 2.x, but it would probably not take too much effort to port/update it. 
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Someone wrote a plugin just for this a few years ago:
This was for Picard 1.4 though so it will probably not work with 2.x, but it would probably not take too much effort to port/update it.