I haven't ever removed the ignition barrel from a Volvo so can't comment on easiest method -
generally the steering lock etc is manufactured with a hidden spring clip that secures the lock and the actual switchgear is a screw mount on the other end of the barrel.
Plan C - fit a relay in the solenoid circuit.
This is potentially easiest - you don't need to remove anything and it takes the high current loading presented by the solenoid off the ignition switch (and inhibitor switch if auto).
Ask if you need a diagram and instructions.
On the issue of wind and weather - bloody breezy here last week and I was sailing in the Hauraki Gulf on my brother's boat (26 foot Raven). Some hairy moments.
Meanwhile, this is what the Australians are sending us...