Uefy 2.0 (Pro Edition) make Blender's rigify rigs compatible with UE5, also has a FREE version

Hi, I’m new to making character rigs. While using Uefy, I’ve tried to follow along with the tutorials, only to fall short. I’m writing this in hopes of someone answering, and maybe that’ll help me better than watching a video.

The character I’m trying to rig is one I made for UE4, in T-pose. The mesh has a double mesh, which is intended to make a stylized outline around the character. After I move the basic human rig in place and made the fingers, I then parent the mesh to the rig with automatic weights. What happens is the mesh underneath working just fine, while the outline mesh doesn’t get weighted. And trying to manually paint the skin weights for the outline mesh has proven almost impossible. Is there a workaround for such a character mesh?