Now I have read through the whole thread and maybe, just maybe, this information passed through my skull hidden in a flock of lighting/collada/lowers figures oriented posts, or maybe it wasn't even there in the first place, but...
Having a P7 installed with an indecently large runtime in there, can I reuse this runtime "as is" in Poser Pro? I would go for the software if it provides decent improvements in terms of bug correction and lighting quality (plus that que rendering is sort of tempting) but if I have to reistall everything I will first have to cry a bit in my corner :)