I don't see the point in complaining about your name choice.
Everywhere lese lets you change your username, so it doesn't sink in that for the Wii u you have to be abso-horsing-loutely positive you will not have to change your name.
Even I had to change my name because I wasn't 100% comfortable having my last name in my NID. But because I wasn't sure about Nintendo's policy I called them and discovered i'd lose all of my eShop stuff, so I just set up a Mii dedicated to eShop purchases (and I do all of my purchases on that account)