Well, I am not qualified to comment (or even follow) a majority of this discussion, but I may have some useful input re: "QNX is POSIX compliant, but the graphical UI (Photon) may be a problem."
Factor out of the box provides an HTTP web server that you can run locally for machine interaction, and browse to for UI control. I have been pursuing this approach in my projects, and it works well. Jim
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