License Management for teams?

I'm looking to purchase several Unity Pro licenses for my team, but I want to maintain ownership of all the keys, and future keys purchased if team additions are made. I've searched google and this site a bit and have seen no such feature. Is there no built in way to handle this? My understanding is that you have to register the key per client, which means I would have to send the key to each team member, and they'd realistically have control of the key. For example, I'd have no way of remotely revoking access via a specific key.

 

I'd assume you'd buy all the licenses on your account, and then use the license manager here:

https://store.unity3d.com/account/licenses

to revoke them when needed. Press the "Activations" button next to the serial number, and it will tell you how many times it's been activated, and give you the ability to disable the activations.

 

Things happen. Every person ever hired at a company was "trusted" at one point or another but things change, so it's good to protect yourself/your company. It seems like common practice to have some kind of organization management system for issued devices and software. Unity Tech doesn't support this officially? I guess the appropriate question at this point would be this: Would activating licenses for people cause any kind of headache later on down the road? For instance, if they download an asset from the asset store? I'm guessing not but I'd like to make sure. $1500 / head is a big commitment for a startup.