So it sounds like the weak link in the chain would be if you were using a moving camera??? I say that because matching the camera moves in the room (using LW) with the camera moves from the "standard Poser render" would be a real pain in the backside. Am I correct in thinking you either don't have Pro Pack or you have a version of Lightwave that's not compatible with it? I ask because I'm still using ProPack with version 6.5 of Lightwave. I end up using the LW renderer (and camera) for everything. When I import the Poser scene into Lightwave it creates LWOs of all the objects. As long as I don't change the names (or eliminate any of them) I can change the textures all I want within Lightwave. I haven't spent much time with Lightwave's SuperCellShader but I suspect it could give Poser's cell shading a run for its money.

Before they made me they broke the mold!
http://home.roadrunner.com/~kflach/