I know this is old but there is another option.
Go into your swatches-->ink manager.
Choose any color other than black and alias it to process black.
It will still show up as the original color in InDesign but will change to black when output to PDF. Most, if not all Adobe products determine color by the name so an alias of black tells it to make whatever color it is black. Note: black will be same "tint" as original so if you have a 100% yellow, it will turn to 100% black, not a grey derivative.
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