All sorted. In case anyone else is after insurance I got cover through Youi.
Had to take the contents away from the farm package as they can only do it as part of the contents. Basically you just nominate a full amount for contents and the windsurfing gear is part of it.
Even covered overseas..
Phew I can relax now..

Ended up cheaper too although we got a 20% discount due to having another policy with them.