Hey there UBreakItIFixIt,
I apologize about the late response, thank you for being patient! It looks like a week after you made this post, Google announced that they are coming out with more personalized profiles. I'm not sure how it's going to work exactly, but it may solve that issue with different accounts for YouTube and YouTube TV. Keep an eye out on the Google TV blog for updates!
I hope that helps, and if you have any other questions or concerns for me, please let me know!