The only way I can think of doing this is to export the DAZ Studio project as a CR2. Open the CR2 in Poser and do the morphs. Resave the CR2. Then open the revised CR2 in DAZ Studio.

But the bigger question is the product. If the figures were morphed in Poser "just for the promos", then how can we see the actual poses furnished with the product? I'm confused.

EDIT TO ADD:  The paths to the DAZ content will need to be added to the Poser library, I believe.  I have to test that and will update.