The problem with 'back away and press 1 again' is ping. With low ping it's not difficult, I do it occasionally but I try to not make a habit of it. With high ping however, it becomes increasingly more difficult. As Lokinir mentioned, Tab (Hook Kick) and 1 (Shadow Drain) should grant you permanent stealth assuming you hit each within .5 seconds prior to the end of your stealth. Even with that though, ping is involved.