You could definitely use diacritics to write Arabic-specific letters in Latin script but why would you do that? I can understand the use case of Arabic transli

You could definitely use diacritics to write Arabic-specific letters in Latin script but why would you do that? I can understand the use case of Arabic transliteration in Latin script languages but other than that it becomes very impractical and inconvenient as the Latin alphabet was devised to represent the sounds common among the Europeans at inception and mutatis mutandis for Arabic. So, it doesn't make any sense to use the Latin alphabet and overload the letters just to transmit the Arabic language through it. The tri-consontant root is another problem and big hurdle for adopting the Arabic script in other languages as it's by design terse and there are a lot of implicit stuff due to omitting weak or short vowels from the words and this could prove problematic for some speakers of other languages. However, the Latin script is still not optimal and there are tradeoffs made in the languages based on it.