This will work using the Smash Stack exploit in the Wii U (Super Smash Bros. will be needed)
In case you do not have Super Smash Bros for Wii, you can pick a copy up on Amazon using the link below.
Note: This exploit once it has been fully tested and proven safe will still only function in normal Wii Mode
Meaning that you will be able to use your favorite emulators and any other homebrew apps you liked on your original Wii.
The Wii U mode is taking a little more time to break, but this is just one step forward into having the Wii U fully hacked.