I got it mostly working: 1366×768 (which is much better than 640×480, but not up to the 1920×1080) I had to use the “grid” driver I found a link to on Reddit instead of the Windows driver Nvidia provided me (ya, I know, should have been intuitively obvious to the casual observer, right?). This changed the card from TCC to WDDM. So, NoMachine has nothing to do with the issue.
Thanks for your support
JC