Exophase
Nothing good will ever come of Exophase.
The keys are also quite visible when recessed.That's not dynamic. The way Tactus works is to set a configuration when the screen is built. Then you can get it to pop out when you want it to. It can not, however, dynamically change where those physical buttons are after the product is in the consumers' hands.
-God Ginrai
I know the OP was thinking of a separate area just for keys and no screen at all but if they're not configurable there's no point. This would also be absolutely terrible as a dpad substitute.