Help: How do I transfer/copy MK8 data from one NNID to a different one in my Wii U?

[t3mporary_126]

Trying to see if I can copy my Mario Kart 8 data from my brother's ID to mine so I can use all the karts and characters I unlocked for him online with my own ID. Anyone know if this is possible or should I just let my brother use my NNID to have his own online points (VR points?) for Mario Kart 8. 

By the way, does changing your Mii in your NNID create a different online profile for MK8 in terms of of online points?

Thanks for the help!