Shrinkwrap for 3D printable mesh

Hey guys,
could one of you WIP-users help me out with a simple shrinkwrap around a bad mesh? It should be super easy to do but sadly I only own a license for Rhino 6 and thus can’t use Rhino 8 WIP.
I have a 3d-scan of an indigenous mask that needs some clean-up to make it 3d printable.
Thank you in advance.

Can you post the model?