or there is the Singapore model - 3 national languages Tamil, Malay and Mandarin with all required to study at least one in school, proficiency is required to graduate - but where the main language of instruction is English. Laws are made in the 3 national languages with English as a neutral language in case of misunderstanding in translation. English is generally the working language of business and government but all 3 national languages can be used for official communication.
Given the make up of the the Cyprus economy - tourism and offshore services - having Greek, Turkish, Arabic and a Latin base language as official with English would following unification be a massive boost the both these commercial areas.