Hi guys, a user in the comments suggested using the headsplit dFormer instead. Here's how to do that:
• Head Split D-Former for Daz Studio
In this tutorial I'll be going through the process of splitting a morph into a separate head and body morph using Blender's shape key system and Daz Studio. I'm using Genesis 9, but this will work with any weight-mapped figure that has a unified morph you want to split.