Process for upgrading from one Magic Key to another

[mel2014]

We were originally planning to get the Enchant Key for our family of 4 but since I've decided to take my kids to both Fall and Spring Dapper Day, I'm going to get the Believe Key for the three of us to avoid the Saturday blockout dates. My husband is going to skip those trips but if he later decided to upgrade so he could go with us next summer, what's the process for doing that? Can it be done in the app or over the phone or would he need to go to the ticket booth (in which case we couldn't make reservations ahead of time)?

 

[bwvBound]

I have no answer on the process (online, in person, etc) -- but the Terms and Conditions suggest that the upgrade can only take place on a day when your original pass would have been valid (not blocked out). Anyone read the bolded line below differently?

Copy/Paste below from the Magic Key Terms & Conditions:

UPGRADES: A Guest wishing to upgrade to a Pass from another form of eligible Disneyland® Resort theme park admission media must upgrade on the same day in which the original form of theme park admission media is valid, and must choose a Pass of equal or greater value than the retail price of the original theme park admission media when it was purchased. The difference in prices must be paid in full at the time of the upgrade. If an upgrade to a Pass is made from a multi-day ticket, the Pass will be backdated to begin on the first day that such ticket was used; if an upgrade to a Pass is made from a lower level Pass, the new Pass will have the same expiration date as the original Pass. Each guest wishing to upgrade their theme park admission media to a Pass must be present at the time of the upgrade transaction. Fully used, or partially used and expired, theme park admission media, complimentary ticket media, special event ticket media and ticket media stating its ineligibility for an upgrade may not be upgraded to a Pass. Upgrades are subject to Pass availability. Downgrades are not allowed.