How do you get access to enterprise? Last I looked, I believe you had to create a company-relationship with Microsoft to be allowed to do that and there was probably a lot more cruft to do.
Edit: and a quick scan of the Microsoft website says that you need to "Contact Sales" still.
For much of my career, I got free Enterprise licenses through an MSDN subscription through work.
You can pay a similar amount to what your company pays for similar numbers of licenses across many OS's. Last I checked it was about ~500 USD a year. Sure, that's excessive for a single OS install, but if your company is footing the bill they usually don't care if you install on personal machines.
Huh, we have the action pack and I just checked, there’s indeed 10 Enterprise keys included. I should try to remember to ask my boss the next time I reinstall if I can grab one of those :D
Edit: and a quick scan of the Microsoft website says that you need to "Contact Sales" still.