Cory, I am aware of the ability to transfer your optional 3rd part Liability Insurance that has been purchased for your snowmobile over to your Quad for the summer months but you must be a member of a Club that is a member of "The Association of BC Snowmobile Clubs". I have never heard of the ability to select either a boat or Quad as you suggest.
Both Green Lake Lake Club and Interlakes are members of ABCSC.
Cheers
Kiwi