Rescues can be tricky, some of them are downright crazy. Been there, tried that. :I
Since the main reason for requiring a "fenced in yard" is to ensure that the dog can not escape, I think installing a large chain link fenced in area around your house (whichever house you want to keep the dog in) would work. So essentially make it sound like it's a house with a large yard on your property, and pretend the rest of your farmland is moot. LOL. It's all in the phrasing...
After you guys get this installed, I wouldn't even mention the word "farm", since some rescue people flip out over the word. Just say "large property with fenced in yard". haha. I would also emphasize that the dog will be an indoor dog, and won't roam freely in the yard when you aren't watching. Most rescues like dogs staying indoors, and they hate the idea of kennel runs.
Make sure the chain link is at least 6 feet.
I have experience trying to adopt through a load of GSD rescues, but I'm sure husky rescues would be even more strict about their fence requirements, since huskies are known to be escape artists (jump high, dig deep) and don't come when called lol.