Can you graft a male to a female hardi variety?
It is easier to just plant the two right next to each other though. Prune the male to just be a “head”, it doesn’t need to spread on the trellis. I have 4-5 different males all taking up very little space.
I completely agree with Scott. An extreme weather event will eventually kill vines down to the ground. New vines grow back rapidly, and will typically bloom the following year. Grafts will be lost, unless you keep backup budwood for regrafting.
There are also self fertile hardy kiwis. I grow issai hardy kiwi over an arbor in my yard. I just have the one variety, and I still get more kiwis than I know what to do with, and I don’t even do a great job with pruning, cause it grows faster than I can keep up with.