Target select to Slide Relax brush tool

I love the slide relax feature in sculptmode, but one thing that would elevate blender quite high would be to be able to select another target object as "shape target". That way when you relax the topology, the form will morph to the shape of the targeted mesh. Maybe using some kind of world space baking? Would be extremely useful for when you want to reuse a base human topology and transfer that to a Dyntopo made sculpt :) Would be a step closer to blendshaping between different topology meshes