I think it's possible to have both the Creative Principle and 'God', as in Hinduism Brahman/Brahma, Kabbalism Ayin/En Sof, and so on. The 'God' here is still a creative principle. The argument you are using gets tricky, because you have to define precisely what is meant by 'person' in this context. How would be ever know that we are not merely anthropomorphising?

As you say, good and evil might have no meaning for the (ultimate) Creative Principle, but this becomes a meaningful concept at lower levels of emanation/ manifestation.