I ran across some utube videos on grafting squash and other cucurbits. I have a idea to use a moschata group pumpkin ( no borer problems) for the rootstock and graft zucchini to it. hopefully I can keep the vines growing. I know about the other solutions but I get busy and neglect to do them in time. I do save one on occasion. I always get enough for myself and surplus go to the chickens. I even stagger plantings but it would be nice to have them produce all season. Also some pumpkins in the pepo group do poorly in my soil. This may be helpful for them also.