I am also still interested in the topic and would love to see VR support for the 4.26 volumetric clouds.
I made some progress on this topic. The version of the Volumetric clouds plugin in UE4.25 works in VR with “mobile HDR” disabled and “instanced Stereo” enabled. But the cloud material has very limited customizability and the performance is terrible compared to the UE4.26 clouds. See here:
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