Retargeting hand only animations

I want to retarget the animations provided by oculus in their oculus integration package to another hand rig (with exactly the same hierarchy). How would one do this? Is it a good idea to use hand only rig instead of a humanoid rig?

I have the same issue - or rather a more complex one:

Can I use those animations, made for a “hand rig” on a Humanoid rig? So only use them on the hand bones.