Here's the thing. Now you're putting wear and tear, no matter how slight, on your device, you aren't being compensated for. Furthermore, you're opening yourself to legal exposure where your drives and data could be seized under reasonable suspicion you might have something on an unauthorized device. I make an ultimatum to people who employ me. You get me a workstation. You give me admin, you put your MDM or whatever on it, and you let me do what I need, and it gets back to you on cessation of employment unless they decide to sell/gift it to me as an acknowledgement of deprecation/whatever. Do not cross the streams. They employed you, not the other way around.