I tried this when I had my knees scoped nine and ten years ago. OMNRF criteria says that the condition must be permanent before they'll issue a permit. Maybe,with any luck,those criteria may have been relaxed since then. There's certainly nothing to lose by asking.
The folding chair beside the ATV is the best idea. I did that when I had my knees done. It doesn't take much to build a first class brush blind with your ATV as a base with a simple tarp,a couple of poles and a little imagination. I still use that technique to this day when the weather is really crappy and we'll be out in it all day.