I would say add your reservation to your MDE ap and give it a try. Not sure if they have any way of knowing there if you are on an exchange.
I think the procedure now is you have to show up and get put on a list. But as a non-blue card owner I have no experience. Found the below on the Disney site.
Accessing the Lounge
Special access to the Top of the World Lounge – A Villains Lair is available to eligible Members on a first-come, first-served basis until the lounge reaches capacity. Due to the lounge’s popularity during Happily Ever After—the Magic Kingdom park fireworks—arriving as early as possible will offer Members the best chance of gaining admission to this exclusive experience.
To guarantee a spot for your party, you can book a dining experience. Please refer to the “Wicked Wind Down” and “Enchantment at the Top Dessert Party” sections on this page for more details.
Eligibility
Eligible Disney Vacation Club Members with access to Membership Extras may enjoy this exclusive space just outside Magic Kingdom park when using their Membership to stay at a Disney-owned-and-operated hotel at Walt Disney World Resort (whether they booked with Vacation Points or cash).
Party Size
Each eligible Membership can enjoy Top of the World Lounge access for one party per day—which can include eligible Members and Guests staying on that Member's reservation. At least one Member in the traveling party must accompany the group and present their current MagicBand, digital Membership card and government-issued photo ID in order to gain admission to the lounge and observation deck.
Restrictions
No outside food or beverages may be brought in. The lounge is available weekly on select nights, and is subject to blockout dates or limited access on holidays and special event nights. On event nights, Members without reservations may have limited access to outdoor patios at the lounge. In addition, use of outdoor patios is weather permitting.