Successful Conversion of HDT/CBBE Oldrim Armors to SSE Is this possible?

To wit, I've downloaded a couple of CBBE/HDT-enabled armors for Oldrim. Here are the specific steps I took:

Download (duh)  
Open Creation Kit (SSE)  
Re-save mod (esp) into Form 44  
Optimize meshes with NIF Optimizer  
Open and build armor in Bodyslide  
Add mod to load order and sort  
Launch test game

While the armor imports fine and looks normal, it doesn't look like physics work.

I have HDT and the HDT framework installed (obviously for SE), along with FNIS, animations, and the XPMSSE skeletion. Labeled SSE/CBBE/HDT armors work fine (as expected).

Is there a step I'm missing to import/convert Oldrim armors? TIA for the help!