it is still possble to mod the newer versions of wii
if want do a home install it is suggested to just buy a second hand old version from sum where ebay would be your best option
below is a basic info of the models out on australian markets & there serial numbers
Under LAH1016 These is a normal wii with DMS/D2B chipset. Most people with a steady hand and some soldering skills (and the right equipment) should be able to do this installation.
Between LAH1016 and LAH10216 This is a wii with 3 pins cut out of the consoles IC. The IC is what the wiikey 'talks to', with the 3 pins cut, the wiikey can't talk to it, hence, it can't work! It still is moddable, but extremely hard for most people. 50% of so called 'professional' modders cannot do it, all of our installer have done them, and will do them for an additional fee. Please see the wiikey install page for this.
Over LAH10216 D2C chipset. The 3 pins are still there but the IC is a different model. The model blocks modchips from running. Nothing to do with wiikey, EVERY current modchip is blocked from working. Hackers are working on a fix, but don't hold your breath.
but indeed the best way is to actualy open the console this would e the best way
also beware if plan buy a premodded unlocked wii on ebay most do indeed have 3rd arty wiikey chips you are better off buying a old console & getting mod done yourself from a local installer or do the install yourself