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There is only one reason to breed dogs and that's to improve that breed. I see no benefit to cross breeds. If there are traits you would like to enhance in a breed do the research and find those traits within that breed.
Reading upland journal, a number of owners and breeders talked about these two dogs and from the sound of it, two of either breed are not built the same. It almost sounds like luck of the draw as to what traits you get. Some say the Gwp is not built for family life as well as the Wpg is and others say they are. Instinctive hunting is stong in some of either breed and not in others and so on. Makes it hard to decide what kind of hunting dog to get.