In my experience, no, the disposable 'wands' can only be used individually.
If you didn't capture much hair in it on your first try, you may be able to clean it off. But I wouldn't plan on it. Our drain was pretty clogged before I used the Drain Weasel and it seemed best to go straight to the waste basket after using it.
No, I don’t think so. There is nothing on the end of the drain weasel that will hook onto the wire loop. The drain weasel will just push it down further. I would suggest taking a thin coat hanger apart and make a small loop at one end (you’ll probably have to use a pliers to do that). By putting that loop down your sink pipe, you may be able to hook the wire loop and pull it back up.
No, they don't.