Nuxil a member over at WiiNewz has released a video and tutorial on how to conver the original D2Ckeys into a 9 Wire D2Pro install. This is not for the novice and requires a bit of skill but in the end it does work.
You will need the following
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D2Ckey
Zener 1n4148
SPI Flash 25vf080b
Clock cCrytal 50,000 38407 (one of those)
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You can find his guide on how to do this here:
First, built the modchip