I still don't get it. The rubber dome apparently constrains the spring, which gives the velvet feel Wellington talks about. But what is the actuator? Something that shorts a pair of contacts on a pcb? The Wiki gives me this "With the HHK Pro, however, a circular cone spring systems was adopted. This system is based on an electric capacitance system instead of an electrode system." Pressing the key makes the spring into a capacitor? The rubber dome is one side of the capacitor and proximity actuates it?
It boils down to this, could the thing be cut in pieces and still be reworked to function....