I've recently discovered the very nifty LiveShare feature for Visual Studio Code, giving up to 30 (!) users the ability to collaboratively pair program on a wide variety of languages, including debug access, terminal access, following different user's cursors either as the main view or as a side bar, and much more. It's an amazing solution, but VS Code's R support doesn't support breakpoints and I'd really prefer to be in RStudio anyways. 
While collaborative editing has been discussed for RStudio Cloud and there is some early functionality for this in RStudio Server Pro, from this thread it doesn't sound like there is much more available yet. tmux-style solutions are technically complex and not super cross-platform (and cross-network). Has anyone found other tools that get closer to the MSFT LiveShare experience, but from within RStudio?