Ok, now you’ve lost me 
what do you mean by “treat it as a single rotation”? This is the data i get from the plugin:
the rotations on the far right are the ones of the finger tips. How can I treat three relevant rotations as one?
The location is no problem. Before I concern with the rotation in BP, I get the location for the object and this works fine. The green arrow from my second drawing is the location of the object which i calculate.