Thanks for your explanations! I also submitted a bug on Launchpad for the UN flag but had not get that it was related to the same issue.
So, there are workarounds, but what should be a long-term fix?
Should the apps request for united-nations, update-notifier, cc-flag, sh-flag instead of confusing shortcuts un, cc, sh? I assume that it will impact other themes, but it may help disambiguate in the general case?