I'm not familiar with yewtu.be, but couldn't you accomplish the the same thing with a simple Host File entry in your operating system? Get the IP of yewtu.be (by pinging it which I just did to get 104.244.72.25), create an entry that says:
youtube.com 104.244.72.25
So when your OS goes to find youtube.com, it gets directed to the IP of yewtu.be