The wind is obviously a big factor in calling. Perhaps its bad advice, but I would give it a try once to see how things go. Be ready to take a longer shot than normal and I would shoot as soon as they came in to range. Don't give them a chance to study the wind very long.
I'm not a wind "expert", but from my experience, I can have the perfect set up, as far as the wind goes, when I start, than the wind shifts and it starts blowing directly down range. Many times the fox will "cut" the wind cross ways as they circle. If you can get the kill as they are cutting your wind prior to them reaching it, you may be ok. Only one way to find out.