http://s1186.photobucket.com/user/jonathanpitzl/media/image-3.jpg.html?sort=3&o=0
It looks like your previous owner drilled a hole in the block off plate and used that to feed lube into the crank case.
Don't bother with the zerk. Unless you feel like buying another delete kit/block off plate, just run it like you have it. You do not need a zerk fitting anywhere.
Fill that turkey baster up with oil. Pump it down. And when it snows just keep pemixing your gas/oil and forget about all that other crap.
Your snowmobile is fine.
I think the early bdx kits had the zerk on the block off plate. New ones don't though.