Single Stroke font ( like font for CNC / engraving )

I’ve been trying to get this to work for me (I want to use a custom single line font in Rhino), but I haven’t been able to get open paths to work properly. I have an average of 2-3 open paths per glyph and everytime I export the font (as a TTF and with ‘remove overlap’ not ticked) some paths go missing or collapse in on themselves.

There is a way to make a single line font with closed path by simply duplicating every point (on top of one another) and creating compound paths that don’t have a thickness. But, the flaw in this method is that the CNC operation will be doubled as the tool will have to run the path twice (wherever the path/points overlap).

So, I’d really like to get these open paths working with Glyph. Does anyone have any other ideas/advice for me? Seems like Tim and Martina got it working.