One problem with the "text field with clustering suggestions" method is that it may not be obvious what to cluster toward. Taking Austria as an example since you mentioned it, it's unclear to me whether the cluster point should be Austria (de facto understood as a name for the country worldwide, but an exonym nonetheless), Österreich (the official name in Standard German), Oesterreich (same, but changed not to use diacritics), Esterreich or Estreich (in Boarisch, the most common German-family language used in Austria) or Аустрија (in Serbian, which is one of the official regional/minority languages of Austria)?