Quikwriting for the XBox

How would you adapt Quikwriting pen-based text input to an XBox Game Console, where you've got two joysticks rather than a pen?

I made this design experiment to see how it would feel to pick one of nine "letter groups" with one joystick, and one of nine letters in each group with the other.

I made this just to stimulate thinking. There are lots of other possibilities...

Instructions: