That sounds like a good plan for those not-so-Poser-friendly apps, odf.  My personal experiance is mostly with Cinema 4D + my Riptide Pro plugin... in which case, all vertex-ordering and grouping and material zone assignment is maintained, so (just for C4D users,)you simply Export from Poser, Import into C4D, make your adjustments and re-Export.  In fact, my plugin even preserves UVMapper's "Region" selections (just another means of categorizing polygon selections.. I typically use them to specify uv-mapped islands (sets of polygons that wil be using the same texture file)).

Cinema4D Plugins (Home of Riptide, Riptide Pro, Undertow, Morph Mill, KyamaSlide and I/Ogre plugins) Poser products Freelance Modelling, Poser Rigging, UV-mapping work for hire.