I apologize that I haven't had time to read through all of the background and ideas, but could you "sell" special visits to your compound for the future? Like, donate $x now, and we will host your special donor visit sometime in the next Y-Z years. I suppose your compound may be open to visitors anyway, but perhaps these visits could be in some way more special, like, the compound provides the tent and feeds them and maybe takes them on some walks on the land or nearby or something like that? Just an idea...