If the argument is about democratic principals then examples from ANY democratic system have a relevance.
No. What would be relevant is democratic systems in
countries and the power sharing between majority/minorities in other multi ethnic countries.
There are many relevant examples. Turks in Bulgaria is the most relevant one. We are again talking about a Turkish minority in a country that appeared during the Ottoman ruling of this country. Sure, there are some differences, but this is definitely the most relevant case.
Will you argue that the relationship between UK and Lithuania within EU is more relevant to Cyprus than is the case between the Bulgarian majority and the Turkish minority in Bulgaria?