Cyprus held a referendum to join Greece in the fifties, and the Greeks are the majority. But there are still Turks on the island who resisted and lead to a war in the seventies. For the most part the island is still split between the Turkish and Greek half, with Turkey still there with an army on the Turkish side. I imagine and second referendum to join Greece for merger would lead to the two coming to blows during the war. So you would still need to at least drop your neutrality with Turkey and go to war.

But look at it this way: You'll also get a moment to reclaim Constantinople if you win.