i recently ported the original QGIS2.x VO_QGIS_plugin to QGIS3.x.
I also tested some full functionality on Linux (Lubuntu 19.10) and Windows 10. Seems to work also on MacOS.
The new plugin can be found here: QGIS3.x
The old plugin can be found here: QGIS2.x
Hoping that could be useful, please let me know if there are problems.