First, North African languages are called Arabic. The proper written form of Arabic is the same in every country. The Berber language never had a written language or letters and only confuses the matter. It is a tool used to divide the people. Can you imagine Palestinians demanding Caananite be included as an official language? The most common modern standard Arabic would be found in Syria, Lebanon,Jordan and Palestine, with the Egyptian and Iraqi dialects also well understood. The North African dialects need a major overhaul. In Morrocco, they have borrowed even German words and the pace is so fast half the words are mumbled. Use modern standard Arabic as your focus,and perhaps Latin letters to make it easier on non natives while being able to translate it back to Arabic letters.