It would be nice if Twitch’s partner-only Squad Stream feature was expanded to non-partners. In the meantime, this worked very well on the author’s stream this past weekend with Matt Layher.

Is it possible to set up something like this on macos?

I think co-streaming is accurate. I’d consider remote control a fairly important aspect of remote pair programming, which this tool appears to lack. That’s OK, it’ll work for some uses but not others.