What I did is create a separate YouTube account as a business, starting from scratch. I deleted my YouTube account linked to my Google+ that used my name, but it kept my Google+. Google knows when it's my name and my YouTube username is kept separate. It actually took me way longer than it should when I did this, so I hope this is helpful. It's a good question.
i made a branded youtube channel. i have my real name on my gmail but a different name for my youtube. (can't remember how to do it since it was done 2 years ago but you can google search it)