Enrique De la Garza

The edit material network lop node got beefed up and seems very stable now, you can try to load both referenced materials there and mix them onto a third or just copy the contents onto a new material library.

For RBD objects you should be looking into the RBD procedural and it will save you a lot of export time. But yeah typically pre exporting parts of your graph that you are no longer tweaking, then sublayering them or referencing them back in will be better if you are at the last stage of just animating cameras or lights.

We usually do it this way if you don't care about using a Karma_AOV node.