Well it seems I have a different idea about what a "single stroke font" means, than lcm and Moini. It wouldn't be the first time if I misunderstood. But that CamBam font which lar3ry references looks like Hershey Text.
The Hershey Text extensions probably offer a couple more options than CamBam.
I already have Hershey Text, as it was part of recent Inkscape versions.
However, the fonts are still limited to a few that I could use.
As well, the Hershey Text is not a Windows font. In order to use any of the fonts in it, One has to elect the extension (Render->Hershey Text), type in the text, then apply, then move/resize, etc. Cambam, on the other hand is a Windows font, and can be installed into the font directory, allowing one to just click on Text, and treat it like any other system font.
To me, the ideal solution would be to have Inkscape do automatically, what the extension "Custom Stroke Fonts" does. Unfortunately, most of the work in that is done manually, by defining all the font characteristics and using bezier curves to draw the cnterline strokes within the character itself. In the extension, it's easy enough to import a system font, but the rest is pretty difficult for someone without font experience. I'll still be playing with it, though. It's a challenge.
I'm not familiar with cutting devices, but I have a pair of techniques that could possibly answer your question.
Thanks for the response. I could not get any of them to work, and assuming I did, it looks like it would not generate an installable font.
For the first version, one could also use the area fill option of the gcode tools, for the second, the hatch extension would work.
I haven't used the gcode tools at all yet, but I certainly will try it.