Nothing stopping you from making a PeerTube just for your channel. It's functionally no different, and later if you want extra channels you can just make them. I have a single user Lemmy, works great!
You'll struggle to find single user software. You need a way to log in anyway, so why not make it multi-user? I've written loads of software that only ever had one user account (mine). It's basically free, and even freer in modern frameworks because it's usually already there because most projects needs that, so it's built-in.