transparent overlay keyboard case for iphone

Forget blue tooth or wired keyboards for the iphone. What we need is to create a simple case or wrap around keyboard that presses down on the existing keyboard on the iphone screen but acts as a blackberry keyboard.
Basically take apart a black berry or some other smartphone, lay the keys over the iphone keyboard, have the biometric hookup, and we have a keyboard that gives you blackberry feel and speed.

It should be transparent so the keys shine though and is useful in mutliple languages.