Hmmm... the only other converter I'm familiar with is called Crossroads, but I did some hunting and it seems to have disappeared. I'm not sure what other converters are available that might work for you.

I'm afraid that Blender Python scripts won't work with Poser, at least not without some modification. Each scripting environment depends on being able to talk to an instance of a Python library that's embedded in the executable, which means that loading a script for one into the other will probably yield a bunch of syntax errors or "missing library" errors.

I know that Blender has built in support for importing VRML 1 files; I'm not sure what it will do with version 2 files. If you can get them imported into Blender, though, you can certainly export the result as an OBJ file, which you then can import into Poser. That may be a roundabout way to do it.