do you think your average desi will pronounce it properly even if you wrote in Arabic?
those who know the correct pronunciation, will do it despite whatever transliteration script and formula you use in roman script. (personally, i have a major allergy to using those fancy ascii code letters in transliteration when mentioning letters such as ط or ص or ض or غ or ق or ظ, but do see their use when a proper academic paper or book is written which has a mention of uncommon words, other than the popular or standard words like "sal Allahu 3alaihi wa sallam" or "shaykh" or "Allahus Samad" or "Salam Aleikum")
those who don't know, they can't be helped even if you write in Arabic itself. how many people pronounce Arabic names like Arif or Abdul Rahman correctly even when written with their right spellings? they have to get their pronunciations right reading the Arabic script