I think that would fit the bill. I've been researching it a bit more to showcase pubs on my site. Depending on the population, I would focus on domain of one's own (#DoOO), #IndieWeb and Hypothesis ( @hypothes_is That's my intersection currently.
Yes collaborative real time editing works, but you get not chat featur, not a big deal given we all have fourteen chat clients open at once….ohh and @hypothes.is is native in Scalar. One button activation.