Mesh remapping / deformation

Hi ,

I am trying to deform the 3D mesh of an open hand , my goal is to deform it in a fist position.

my idea was to use the flow along surface command and use a SUBD cage as goal but this command is working only on a single surface and not on a polysurface or neither sub D

maybe below image can beter explain

any suggestion on which one is the most convenient way to deform this mesh in rhino ? thanks.

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