Yes you can.
You have to work around it, try this:
1- Go to the pose you want to correct on your skinned mesh.
2 - snapshot the mesh for that pose.
3 - Create a copy of the original mesh for morphing in its initial pose.
4 - Add Morpher on the copied version.
5 - Add the snapshot pose as morph target and put that at 100 percent.
6 - Put edit mesh or poly on top of the Morpher and edit away for corrective.
7 - Delete or turn off Morpher when you are done.
8 - use this as a target to morph as corrective for the pose of your skinned mesh.
9 - using reaction manager to link it now would also work.
It works fine even in unreal, I’ve tried it.
