Sorry, I'm extremely busy lately, but now some end Summer things like pool closing are out of the way so I should have more free time to donate.
Still making progress I think and also plotting out the next moves.
Did some preliminary research a while back into wrapping the Emscripten/HTML5 Engine with Electron (which includes Chromium v8 or v9 engines and Node.js, macOS universal native runtimes).
You can install Electron and something called 'natifier' with 'Homebrew' on macOS, from most Linux repos, as well as in FreeBSD Ports list.
Natifier will wrap ANY web-site as an app, cross-platform in that it runs on any platform that has chromium and node builds.
nativefier --name 'OpenXTalkietron' 'https://openxtalk-org.github.io/OpenXTalk-Playground/