There are parts of Zonkeywords that do work outside of the USA for the Ninja pacvk. Here is a video from our CEO, explaining the use of Zonkeywords outside the USA:
http://www.youtube.com/watch?v=WxeDDEvutHA

The marketplaces covered by the ninja pack keyword x are US, UK, CA, DE, FR, ES, IT, AU and JP.

As for the Reverse Asin, this is only available for the US market at this time.