Action to convert 4-colour black

Hi
I looking for a smarter way - an action - to convert an Illustrator file with various combinations of 4 colour black to 100% K (black).
It could be that the document has a lot of different combinations of black (fx. 86,5C, 89,6M, 88,9Y, 87,4K and 87,9C, 88,6M, 90,1Y, 89,3K and so on) that all has to be converted to 100K
Is is possible to make an action that can do that or is it always the hard way of selected on colour, select "Same Fill & Stroke", and then select 100K.
Hope someone can help.
/Klaus

I do it normally so:
Open color panel
select all art work
in the panel's flyout menu select create new color group
activate make global colors
deselect the artwork
select all swatches which should be the same (from the new color group) and merge them
correct all swatches as you want, this will now recolor the artwork

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Action to convert 4-colour black

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