Actually, if I remember correctly, the UCT physical tickets (not the digital emailed ticket) is refundable with a 5% restocking fee. Provided that it is a ticket that is still sold.
From their website:
What are your cancellation / refund policies?
Your confidence in purchasing takes priority, which is why we offer a 365-day Return Policy and use common sense and fair practices when dealing with your cancellations and refunds. If you believe you are eligible for a refund, please contact us for further shipping instructions. Once tickets have been received and verified by Undercover Tourist, we will issue a refund back to the initial form of payment according to the terms below within 15 business days.
• If you require a refund - a fee of 5% of the total order amount will be charged to cover the delivery, handling and the processing fees associated with accepting your credit card and fulfilling the order.
• Tickets must be unused and unsigned to qualify for the 365-day Return Policy.
• Expired tickets, or any ticket not currently sold on this site, are non-refundable.
• If a RFID profile has been set up on Disney tickets they cannot be returned or exchanged.
• Disney E-tickets are not refundable once the order has been placed.
from the page https://www.undercovertourist.com/faq/ under Disney FAQ
Your wife may still injure you if you say "it'll cost us $87.50 to return these tickets", but maybe the injury won't be life-threatening? ;-)