Good article in LDS. If the buyers are sincere that they do not wish to develop the island beyond one simple home and only need a security blanket of sorts, then the solution is pretty obvious--in a 3-way deal, Camp Belknap could buy the development rights to the island from the current buyers for $500K to $1MM (I leave the exact number to the principals). The current buyers could pocket a big slug of cash today, dramatically reducing their risk; and Belknap could insure its tranquility for a lower price than would otherwise be possible.
https://www.laconiadailysun.com/news...6e83059d7.html