welcome to genvibe. What year is your Vibe?It is not hard to remove/reinstall the rear wiper from the hatch glass.
http://forums.genvibe.com/zerothread?id=40828 shows how to remove it, should be just reverse order to re-install.If the glass was intact, to open the glass and move it independently of the rest of the hatch, you can put a key into the hatch lock, then rotate the key clockwise. It will move a little, setting the hatch to be locked. If you twist it a little bit further clockwise, past "lock", that should release the glass catch. Also if you have power windows/doors there is a button in the dash to be a glass release, but I don't have that . So try putting the key in the hatch lock, twist clockwise past the lock position, and get ready to catch the wiper as it falls off.For me, whether to get it with or without the wiper already attached depends on how much more it would cost to get it with the wiper. If it was only a few dollars, I'd get it with the wiper. If it was an extra $50 or more, I'd get the glass without the wiper.