okey dokey, thank you for that
unfortunately neither of those options are available to me at the boat's current location.
WHen re-rigging the boat there is a crane at the boat yard where she will be launched, but that will come as part of stage two!
so far the best option I have thought of is to climb atop of a telegraph pole and secure myself using climbing harness then hold the top of the mast whilst it is lifted from the base. then lower the mast with a couple of lengths of rope in a 'V' formation.
A somewhat 'heath robinson' approach for sure but so far (due to location) may be the only way forwards, or downwards should I say...!