First time posting, but I was really stressed out about upgrading my package tickets to APs out of fear of losing my 10/1 reservation, so I just wanted to share my experience with anyone else concerned about this. I had also heard the advice to wait until the last day of my park tickets so as not to risk losing the 10/1 res, and being disappointed because that meant not getting the perks for the entirety of my trip. I also saw some saying that tickets can't be upgraded until check-in if they're part of a package, which was also not ideal for me because I'm getting in late on 9/30 and didn't want to have to add this to the chaos of 10/1. Before upgrading, I had a three day ticket as part of a package for anniversary weekend (the tickets I wanted to upgrade) and a Christmas/New Year's trip with two separate bookings because of a split stay.
Someone on here recommended calling the number for changes to your package, so that's what I did. 407-939-1863. The CM, Renee, immediately instilled confidence because she knew exactly what I was talking about, understood my paranoia over the 10/1 reservation, and was able to list out the options right away without hesitating or needing to ask around (she was the 3rd CM I've talked to about this, in person at DS and by calling another number, and the others had basically said they couldn't help but also clearly had no idea what they were doing so I didn't trust them to touch my reservations anyway). Renee's immediate listing of the options indicated that she had handled this scenario already, so I trusted her more to not mess this up lol. What she did was processed the AP order first and had me link the APs to my account while I was on the phone with her. This was NOT a bridge, and I temporarily had both day tickets and the AP connected to my trip. This helped make sure there was never a point that I didn't have a valid ticket (although that was more for peace of mind; she said it won't do anything if you temporarily have no ticket). Renee said that if you have no valid ticket, in 24-48 hours the reservations will drop. So as long as you link the APs right away (and why wouldn't you just out of excitement!!), the reservations will stick. She then canceled my Christmas tickets first, that way we were able to go in and confirm that my reservations were still there, and in case a glitch happened, I would be able to recover those reservations that have plenty of availability. We did that, and everything was fine. So once she'd convinced me with my Christmas package, she took the day tickets off my anniversary package and re-booked it as room only. No issues . . . PHEW! My reservations held after the refresh, and she even put me on hold to check in with another unit of guest services that everything was linking up on the back end, which they confirmed. Also, now that my tickets are canceled on my fully paid package, I'm getting a refund in full within 10 business days. So it's kind of a bridge rebate if you will, where you pay the AP in full but then get a refund for the cost of your day ticket.
Finally, she told me to take screenshots on MDX before we did anything so that I had proof that I had the 10/1 MK reservation. She said that way if I notice they disappear at any point or it's not working day-of, I have proof of the reservation, and then she said they have way more ability to help than someone trying to create a new park reservation on a sold out day. Basically it sounds like there MIGHT be some back-end magic they can do to recover your reservation as long as you contact them as soon as it happens (or as soon as possible after) and have proof.
So anyway, long post, but if there's anyone else who is panicking about a 10/1 reservation with a vacation package but also want to make sure they get to use their AP perks for the duration of the trip, definitely call that vacation package number instead because those CMs get the paranoia and know what they're doing!