Tim Drayton wrote:It is possible to find a number of very stable and successful countries which have multiple national/recognised/official languages, e.g.
Singapore: English, Malay, Mandarin, and Tamil
Switzerland: German, French, Italian and Romansh
Finland: Finnish and Swedish,
so having more than one official language does not necessarily lead to division.
(I accept that there are counter examples, too.)
I don't know why you are playing as if naive?
There were real reasons behind the English enforcing Turkish in Cyprus. We see the results today.
"...the Treaty of Lausanne forbade Turkey from involvement in former Ottoman territories. The British government's motive, as we shall see from the documents*, was simply to divide Greece and Turkey, and Greek and Turkish Cypriots, to facilitate its continuing hold on Cyprus".
"Britain and Cyprus", W. Mallinson, p.5
* Those documents are in the book and available for public viewing.