Just type all the text, then use bezier masks to reveal one letter at a time. Make sure the keyframes are set to "hold". The audio will sell the effect.
You can use a moving mask to reveal them. By this I do not mean a bezier mask, but something like a black card which moves to the right. Do it in jerky steps and you should be able to reveal one letter at a time, instantly.
Why would bezier mask take you four hours. I use it all the time. Should take you 20 minutes if its a complicated move. Keyframes are your friend! Draw one mask and keyframe it to move when a where you want. Heck I think I can do what you want faster than type it on the typewriter.