An update to my post a few weeks back - I now have a working Home Automation Switch Plate (HASP), interfaced with openHAB!
The display screens, buttons and dimmers are fully represented with items and I’ve adapted the original project creator’s (aderusha on Github) HomeAssistant config files to work with openHAB (including the bottom menu button screen selection/shading logic).
Once I get this fully put together, I intend to mount two of these in my spare switch locations (family room and master bedroom), and mostly use them for lighting scene selection, openHAB status display, and HVAC control.
I’ve forked the original project and created a repo for the openHAB configuration files here, but I’ll also open a dedicated topic (in the new “DIY” category 
) for anyone interested in building one of these themselves.