Nationality bonus
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In the "real world" one could argue that communication is vital to a teams performance. Yet, the language barrier is not included in the game. Firstly, the nationality of a player does not inform a manager on the language skills. For instance with Belgium players; there is no real Belgium language - Flemish/Dutch or French. Eden Hazard said in an interview he solely speaks French, while Jan Vertonghen prefers Flemish/Dutch. There are other nationalities without an "official" language. Secondly, some players are very gifted in speaking a multitude of languages; how can that be implemented? It will require a lot of research.
However, your idea could work for the achievements as in "One team, One Nationality." Having a team consisting of one nationality for the duration of one season - thus, from match day 1 till the last match. In some leagues you start with a team that only consist out of 1 nationality. It will restrict a manager in buying though, which is an extra challenge in some leagues
No idea if this is doable. Solely having a midfield or defense of one nationality is too easy to achieve, no? -
Even I am wrong at times; I believe there is currently an idea, almost similar to yours, that give same nationalities in your team an advantage. So, just letting you know it is a possibility that your idea might come true
