Orbit ortographic ALT question

Hi, I want to orbit around and object with MMButton, and when I press ALT the view sticks to a left, top or bottom view in ortographic mode, and when I rotate the object again with MMButton, it will change back to user perspective.

I know that can be done using 1, 3, 7 and 9 from the numpad but I want to know if I can do it with ALT, so my left hand doesnt leave the left side of my keyboard