I am assuming that your boat is internally wired for 220V already.
My onboard inspections in NZ have really just involved ensuring that there was no internal wiring
exposed in such a manner that it could suffer mechanical damage.
Shore lead.... must be tagged and have the correct plugs on the ends. My experience is based on Gulf Harbour/ Tauranga late last year / early this year.
I just bought a new shore lead at Bunnings, cut the plugs off the ends , and fitted new ones bought from Burnsco.
They want the blue ones which have the clear panel so the polarity can be checked without opening them up. Look at the ones here ( left and right ) https://www.smartmarine.co.nz/produc...na-connectors/
to see the type required.
When I cut the ends of the shore lead I left about 1/2 metre 'pigtails' so that I could make up a pair of adapters for use 'wherever'.
Hope this helps.