Ok, I understand the functionality that you have in mind. I have started looking at what it would take to broadly allow users be able to use either categories or tags to display links and doing it would mean ripples throughout most of Link Library’s code base.
Are you actually displaying the tags at the moment when displaying the links by country? Or are the tags assigned but not displayed? If the latter, I would have some suggestions on how to use the current functionality of Link Library to achieve a similar result. If the former, then I don’t have an alternative solution.
Is this for a commercial or personal project? Estimating roughly, I would say that I would need to invest 10-20 hours to add support for this functionality. Even with funding, I would likely not be able to commit this time in the next month. Do you have a specific deadline to meet with this project?