The Infectus team has posted up a message that their mod works fine with the D2C Wii chipset and requires 13 wires which is inclusive of the gnd and vcc. They state that in the next few days, a new version of the programmer will be released for this functionality.
If this works out right it could make D2C installations a lot easyer but I doubt that they will be able to emulate the feature set of the D2Ckey.
The confirmation can be found
here