I've tried applying the library universal poses to other than Poser native people with rather mixed results.  I can't really say I've been impressed with the feature, if they had collision detection and prevented limbs from penetrating body parts automatically applied then they would be ok.  I think the results are rather similar to applying poses to figures for which they haven't been designed, sometimes they work and and sometimes they don't.  I don't know if the Puppett Master plugin worked better.  The bottom line is that if I have load an alternate figure for it's pose, then save it as a universal pose and then apply it to my target figure I might as well just do the pose from scratch.  I've found that the best results come from selecting a pose for the figure it's designed for that's in the same ball park as what you are trying to acheive, then tweaking the pose to suit your needs.  This is probably more effective and less time consuming.