Plamenu comes with extended PeerTube support.
Here's an example of what I mean by "extended": an unmodified Tusky client, connected to a Plamenu instance, is able to play a PeerTube livestream.
Plamenu caches the video stream, so dozens of Plamenu users on the same instance watching the same PeerTube stream put no more load on the source PeerTube instance than a single viewer, and I'm currently looking for a way for the Plamenu to participate in PeerTube's P2P, so we can reduce that even further.