I attempted this a while ago. I loaded all my YouTube subscriptions into an RSS reader, and then it quickly became too much for me to deal with. The big problem was that I do 99.5% of my YouTube viewing on a TV, while my RSS readers is on the phone and desktop. I learned that whatever solutions come up with needs to fit into my life. I’m not going to become a desk chair YouTube watcher.
YouTube effectively already has this built-in with their subscriptions. Not being able to turn off the recommended page, or default to loaded the subscriptions when opening the app on the TV are the real issues.
I understand it's not for everyone, but it works for me. I don't watch youtube anywhere else other than my laptop. I can't imagine trying to use a TV app.. but that's a whole other can of worms :)
YouTube effectively already has this built-in with their subscriptions. Not being able to turn off the recommended page, or default to loaded the subscriptions when opening the app on the TV are the real issues.