I have always found following peertube channels from mastodon to be a rough and cumbersome experience, especially since the mastodon clients do not display videos, they need an external browser.

I found that Newpipe can show peertube videos and supports channel membership, with optional notification for new publications. It also shows likes and comments. A very smooth experience.

I guess my initial problem would be solved with peertube redirect, allowing me to open peertube videos from mastodon in Newpipe, but for now I don’t feel I need this further step