Most people have a small gap at the nose, or you can adjust your headset to fit that way, so you can glance down and find the KB if you really need to - you can order custom keycaps if your KB doesn't have the little bumps on F and J as well. If you're not a touch typist, the nose gap is all you've got really, that or set up the voice attack type programs.
You'll find you adjust to it very quickly, couple days and you won't even worry about it.