Wanted: Duplicate SEO Keywords

I sell new & used high-tech equipment. Many main and subcategories should be able to use the same SEO Keyword used in other categories.

For instance, many products use what call is called a"power supply" This obviously is a very common word these days, right? I need to use this keyword in numerous subcategories without having to add some modifier like "microscope-power-supply".

All of my main categories will be unique. I'm only concerned with 2nd and 3rd level subcategories.

If such an extensions already exists then please let me know if you are aware of it. Otherwise I've requesting quotes for a custom extension to be created for OC 2.2.0.0.

thank you