For anyone interested, I have released a major update of the
hmdq tool (https://github.com/risa2000/hmdq/releases) to version v2.0.0.
The tool now includes a native support for Oculus runtime, so it can read the geometry data from Oculus headsets without needing SteamVR. By talking directly to the Oculus runtime, it can collect some additional data, which are not exposed through SteamVR, e.g. the hidden area mask mesh.
Following the release I have also updated the HMD geometry database (https://risa2000.github.io/hmdgdb/) with the new data for Oculus Quest and updated data for Oculus Rift CV1 with the HAM (thanks to @jojon).