Join Thai citizenship group you will get better answers and he has great website can answer all your questions. Applications taking a lot longer at moment, three years is when you can apply
You would really have to ask the Amphur or whomever issue ID where you are if they can add English name in Brackets after Thai name. There maybe regulation against it who knows apart from them
My Pink ID only has my name in Thai, but i have used it at bank and true recently to put phone account in my name. Even though the names of them are in English