There are smoothing scripts available in Poser that can "average" a morph for those not wanting to use the Morph Brush to do it manually.

Of course the best solution would be to fix the exporter so that we would get the actual SubD mesh and not just the cage.

(Or even better, if we could get a fully functional SubD 1 mesh, as morph transfers between different Subs of the same mesh are no problem at all for Poser.)