I've been in the same situation, and it's one of the few times I've appreciated the bureaucracy and red tape that come with being at a Fortune 500 company. Whenever the sales team comes to me asking for another tracking pixel, I just say "We'll be happy to add this once you've submitted the necessary paperwork and it undergoes the the company-mandated security, privacy, and legal reviews". 90% of the time, I never hear back from them again.