I'm still rooting for python:-)
But know very little about any of this.

Python subprocess.call, and pass an argument to MoI ???:
https://www.digitalocean.com/community/tutorials/how-to-use-subprocess-to-run-external-programs-in-python-3

also this link is trying to open notepad...:
https://stackoverflow.com/questions/204017/how-do-i-execute-a-program-from-python-os-system-fails-due-to-spaces-in-path

- Brian

I've never seen Dave's app before and so I searched a bit and realized that it indeed was a standalone app!
So, sorry everyone for the confusion. My assumption was based on what Max did with NodeEditor, which seems to work the way I described.

Thanks Michael. I can move along from that...

FYI: Watching this thread with interest.