It’s a cute idea, but damn that's bulky. Would be better to make a much smaller thing, angled carefully for wrist comfort, that fits in one hand [leaving the other free for screen gestures] and uses chording to type.
Something vaguely along the lines of the Twiddler, but I’d prefer to have 2 keyboard-style mechanical switches per finger and use somewhat flatter fingers, rather than the Twiddler’s guitar-claw-style.