So here is my setup and what I would like to do:
Does anyone know if this is possible?
No, it's not possible. For the time being this is a one-way-road in either direction. There is no live-synching. Once the data has been extracted, it becomes native and exclusive to AE or C4D, respectively. What you want to do will require Element 3D.
Yeah I thought that might be the case. It's a pity because it would be really useful/powerful.
I have Element, but the assets I have from Cinema 4D just aren't playing nicely with it (The UVs aren't coming through neither is the rigged animation).
Rigged animation wouldn't come through. You'd need to bake it as an OBJ sequence for Element to handle it.