I went back to the 21.Q4 Pro drivers now, as I found some hints on the net that those would work with resolve 18. GPU Caps confirms openCL, as always. Unfortunately now I am back to the original Unsupported GPU problem.
zeug(dot)waldpfa(dot)de/download/resolve_debug3.zip
I did a clean removal of the latest drivers with a DDU. I also uninstalled Resolve before messing the with graphics drivers and also removed all traces of it in the file system.
After uninstall, Resolve leaves quite a lot of files on the system, in User folders and AppData. I had observered that after removing all of this before installing Resolve again, the initial Setup wizard pops up again. It showed the green checkmark for a compatible GPU. So I had hoped that this would mean that the GPU detection had actually worked. But I was wrong.
PS: Everything local, no VNC