I came upon a wrinkle today - after upgrading to a Sorcerer AP on the phone, the CM noted that my existing park reservations (made with an 8-day PH) were still there but could be cancelled due to the change in ticket type. She encouraged me to cancel and rebook the park reservations under the AP, and in order to do that I had to update one of my
DVC reservations so it had my name on it (instead of the fictitious name I used to prevent merging of the 2 reservations). This was needed so I could book park reservations for my entire trip under my name.
I was able to chat with Member Services to get the same name put on both reservations, and after I did that I asked the CM to put a note on each reservation that they should NOT merge the reservations without contacting me first. Hopefully that will leave my reservations unmerged and if my waitlist comes through it will only replace the corresponding reservation.