It's impossible to make a system like you're suggesting. When people try to create a "romanized" spelling of the words in their language, they almost always run

It's impossible to make a system like you're suggesting. When people try to create a "romanized" spelling of the words in their language, they almost always run into the problem of sounds that aren't part of the alphabet. To make it work, you have to do something like add accent marks, or create some special letter combinations.