It's interesting to note that that when we use Poseres 'Replace Body Part with Prop' functrion, Poser is doing what we are trying to do, injecting new geometry, but this method has none of the problems we seem to be getting when injecting from a pz2.

'Replace Body Part with Prop' injects 'geomCustom', but 'geomCustom' is not the answer, I have tried that. Poser is obviously doing somthing extra when using  'Replace Body Part with Prop'. My fear it that this might be something internal to Poser, and not capable of being done through a pz2.