Blend Animation montage But only Curve

I want to blend Curve of animation montage to current slot
but don’t want it to effect anybone
it is the face talking staff
I try to use -1 in blend per bone for head bone
but the head still move to base pose/T pose
anyway to blend only curve not bone?
I know I can use curve directly but use animation SQ and montage
make the work easier Visualy
so is there a way to do this?