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The new growth is probably too damaged to recover, but kiwis regrow lost growth amazingly fast. I would remove the damaged growth.

You can only tell them apart once they flower. The female flower will have a small ball inside the flower (which is the immature kiwi) while the male flower will not.

Hardy species will grow in your zone. Here is more info: https://www.gardeningknowhow.com/edible/fruits/kiwi/growing-hardy-kiwi-vine.htm

This article will help you with propagation. Kiwi vines propagate well from softwood cuttings:
https://www.gardeningknowhow.com/garden-how-to/projects/rooting-plant-cuttings.htm

The only reliable way to tell the difference between male and females is to check their flowers. The female flowers will have an immature fruit in the center.

You may need to prune your vines to improve their fruit production. Also, you could have poor pollination—ensure that there is a healthy male variety nearby. Some good male varieties include Tomuri, Atlas and Matua.

The only way to tell a female kiwi from a male kiwi vine is by the flowers, when they bloom. If you are not getting any flowers, it may not be in enough light. Kiwis need a sunny location, sturdy support, and pruning to produce good crops. When planted, the vines should be pruned back to 4 or 5 buds. And yes, they need at least one male plant to pollinate female varieties. Good female varieties to choose from include Abbott, Bruno, Hayward and Monty. Male varieties include Tomuri, Atlas and Matua. Examining the flowers of a kiwi are the only way to determine for sure if you have a male or female plant if unknown or incorrectly labeled. Since yours is not blooming, you may want to consider getting a male variety and plant it nearby.