Yes, as an owner you would have access. Note, however that you can only use non W57 club points during the 44 day window.
You also can borrow W57 points from a future year. The trigger is "owner" not points. If you traded in via RCI, it might work but have never tried.
I would say no. Unless you can document or otherwise provide evidence that you are an owner. Easiest for the hotel would be to say “no”
I’m here at west 57th now so I could ask but I don’t think the regular staff would know. I would therefore be kind a hesitant of any answer.