There's simply no universe where an employee at a typical F500 company is going to be able to convince the IT team that they should permit custom code on phones even if the logic of the argument is sound. Even if they found the person, persuaded them, got them to persuade their management, in house legal teams, compliance teams etc., I seriously doubt whether the MDM solutions (eg InTune) would even have a checkbox to override the policy on one phone. To say nothing of the ongoing cost of tracking that one employee's specific setting.

This also plays a bit into the argument of why integrating your personal device into the corpo ecosystem of your employer is not a decision to be taken lightly.