If you are a programmer, there is an alternative: Use Avatar SDK to query all meshes and animations for the hands. However, you would need to write the output code yourself that does export to a format blender can understand.
For sample code using right-handed OpenGL code you could look at the 'Mirror' sample in the Avatar SDK. ShadedPath engine (
https://github.com/ClemensX/ShadedPath12 ) has code for left-handed DirectX 12 code. There is a method VR::writeOVRMesh() that saves Avatar meshes in a private format. You could use that code as a starting point. (Shaded Path engine can import from blender via Collada format, but not export.)