There was an important release that I overlooked, back in the summer. The free DAZ-Blender bridge plugin by Diffeomorphic, Thomas Larsson,was released as v1.5. This is in active development and at November 2020 is now at version 1.5.1. Apparently it does a good job, and is quicker and in some ways better than the free official DAZ 2.0 script. Since it doesn’t need to convert via an .FBX or Collada conversion and instead reads the DAZ files directly. Said to support polyline hair, but not strand hair. Worth a look, if you’re getting into Blender and its real-time Eevee engine.
Interestingly, I recently noticed that Eevee is actually OpenGL + PBR materials. I hadn’t known that before. It explains why my OpenGL upgrade fixed Blender. It just shows how far OpenGL can be pushed.
Update December 2020: diffeomorphic.blogspot.com totally dead. Fixed links by sending to WayBack and I’ve directly linked the repository.