You can't really change the topology of the G2 character in VAM, or DAZ for that matter. You can change the vertex locations, but if the vertex count changes... it's bad. What exactly are you trying to do and what is your desired end goal? I may have some suggestions, but without more clarity, don't know where to begin. I would pose everything in daz for starters, if you are trying to pose before taking it to blender, but if you are trying to create poses for vam, that's not the way to go. Post some more details about what you are trying to do, and there are many of us that will jump in with suggestions and solutions (possibly).