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I'm going to leave this as status "Unanswered", as I don't think we are much closer to any substantial conclusions on to what extent a non-generic ccTLD influences keyword matching for the country name itself. Based on my own non-scientific searches for various countries and terms like "hotels", "conference venues", "events" and so on, I've found > 50% of first page results from the relevant ccTLD without those sites keyword stuffing the country name into their URLs, so I am going to omit the country name from the website structure itself and stick with a structure of http://mybrandname.ccTLD/service/