As I understand it, this is not something that users can implement themselves, but you can check with your brand admin or Qualtrics customer success manager to see if an exception can be made for an individual survey.

Hi Alea! If you haven't already, I’d recommend reviewing this support page on Vanity URLs to help you get started. If you still have questions after reviewing the linked support page, you'll want to reach out to the  Support team, as they are best equipped to help answer questions and provide support!