Turkish did this right, IMHO, when it adopted a Latin alphabet. No diphthongs at all. One letter, one sound. The “sh“ sound is spelled ş, and “ch” is ç. You

Turkish did this right, IMHO, when it adopted a Latin alphabet. No diphthongs at all. One letter, one sound. The “sh“ sound is spelled ş, and “ch” is ç. You also need to add more vowels, as there are way more than 5 vowel sounds, but that’s not hard. Umlauts are already common in many languages.