Hi
Intune licence are per-user. You don't need a premium licence, but you will need to create a email/id for the user inside your tenant and assign a Intune licence to the user.
After that in the OOBE he could enroll the device using the created id/email you did, or he can enroll it after in the control panel, but the idea is he will add his other work account/id after in the control panel and select for that other account that he dont want it to manage the computer.