Another way,,,

If it's just the head,,, first be sure IK is off and hip/body are zeroed.

Then make sure all scaling morphs (chest size, head scale) are at default. Then the full body morphs (skinny) or anything that effects the neck of V4.

File>Export>Wavefront obj and uncheck Universe. Recheck Head only... Check "Weld" and "Use bodypart names" in export options,,, save it somewhere.

Now,,, select head and go to Object>Load Morph Target. Fill in your morph name and then click on blank square to scroll to your object head saved earlier... click OK..This sets a new dial..

Select head and go to EDIT>restore>Element. This should be V4 default again. Now go to your new dial on the head (way at the bottom) and set it to 1.00. This should give you back what you had... Now you can use the REM INJ to get rid of the head INJ morphs and end up with just expressions...

Just did this this morning..