Metahuman for celebrity

Hi, I’m trying to do a metahuman based on celebrity, I want to use metahuman on the iphone to animate in realtime,

He has unique smile, and the artist who did the blendshapes in Maya says 52 blendshape in ARKit is not enough, and would need a custom rig for it. So wouldn’t it be enough if the artist could adjust the expressions to match to ARKit standard?