You are lucky to not have cold winter in NZ ...that would be impractical [for me]for long time survival during COLD winter without heating the inside with a wood stove.They are standard 20ft reefer shipping containers.
Ideal to shelter in for; earthquakes, shake around, but not collapse. Fire and extreme heat, designed to keep frozen products in, so outside temp maybe 20c X 7 = 140c [100centigrade is boiling point] will be hot inside, but survivable. Powerful wind and storms; heavy enough to stay put. Tsunamis; Keep well away from any coastline.
Also ,there is no protection against the penetrative micro waves that you expect will be generated by that unprecedented CME....if as you suggest the micro waves will be strong enough to melt the Earth's crust, everyone in the side of the Earth hit by that unprecedented CME [if it happen] will literally cook exactly like [in a microwave oven] even in your shelter....If a radio work inside your shelter than mean that electromagnetic waves can penetrate it as well than micro waves.
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