I once had my fuzzy kiwis get killed back to the ground by a severe winter, but they grew back quickly from the roots the following spring and were flowering 2 years later.
As far as protection, I’ve thrown a blanket across the top of the “tee”
trellis with it dropping to the ground on both sides to protect the flowers from late frosts and would likely try this in the event of another severe cold snap, possibly in combination with a small propane heater under the blanket.