I don’t think OpenGL support for RDP (Remote Desktop Protocol) is very elaborate when using desktop OS on both ends of the connection. Rhino 5 uses OpenGL technology from the late 1990s (OpenGL 1.2); Rhino 6 uses OpenGL technology from about 2010 (OpenGL 3.3 and 4.1).
We’ve also noticed that RDP performs poorly, and don’t have plans to improve it. It’s months of work, and there are many better options out there.
Some other options are: upgrade your office internet connection, and your user’s home internet connections, and move the files back and forth. Or, spin up some AWS machines that host desktops, and run Rhino there (as well as storing all your data near the AWS instances). Or, use VNC.