Oh, in case of any interest, I tried to create a avatar using “Ready Player Me”. I think it also generates VRM files (GLB for sure). But this one has no root bone, so would be a pain to animate.
Note there is something funny with the rendering in Omniverse. In Blender it looks good:
The same GLB file imported into OV has some texture problems on the face, hair, and hands.
I uploaded the GLB file if you want to look yourself ready-player-me-1.glb - Google Drive