Seems like every dxf-to-g-code converter I've tried (and that's quite a few today), is just for engraving. Is there any that will (1) compensate for the tool-bit diameter, and (2) allow me to try it free (even if it's time-limited or has a limited number of output lines) ?

Cheers,
-Neil.

Neil,
Try Sheetcam
This will do exactly what you are talking about. It is reasonably priced if you decide to go with it, has excellent support and is being upgraded on a regular basis.

www.sheetcam.com

Good to know. I had requested an eval license from them so hopefully I'll have it soon.