There is Dzongkha keyboard for WIndows that allows people who are familiar with Tibetan alphabets order to type Tibetan. For people who are comfortable with English sounds of Tibetan characters, this keyboard offers the convenience to type Tibetan characters based on their English phonetic.
There are more than 26 alphabets in Tibetan hence it is not possible to match all alphabets on just the English alphabet keys and some of the Tibetan characters are mapped onto symbol keys.
Vowels...