A fool and his life are soon parted.....
Or have I got that wrong? Its was a fool and somethin anyways...
I concur with the concurers above.
Its not to say that 300 days in the southern ocean would kill you, but the chances of it happening, considering it must take in a portion of autumn or winter, would be so high as you fall into the ding-a-ling category of extreme adventurers like the French jerk who tried to walk across the Australian desert with a pound of cheese and a litre of water. (The plastic of the water bottle would have survived)
Remember the teeny-boppit American girl who tried in a specially set up, not costs spared 40 footer and she sank the thing. The Aussie teeny-weenie was in a pretty good boat even though it was only a 34 footer it was an ocean racing thoroughbred (I did some long offshore races on a sister vessel)
I don't really know what a CS30 is but as you mentioned you are on a forum of owners they may be able to tell you about its abilities.
What is possible is to do a cricumnavigation STOPPING and dayhopping (ie weather windows) via the Straits of Magellin or the Begal Canal (I've forgotten which one is the better to do); then the tropial pacific; north of Australia; Madagascar; South Africa dayhopping the Cape of Good Hope, all dopne in the correct seasons.
Remember your death really wrecks a long life time of enjoyment