I have did something similar on the past where where I created a script the create a local user (on Linux not integrated with LDAP) with the same name of the virtual machine requester and add that user to the sudoers. The following blog post shows something similar, but to a Windows virtual machine, but I believe that you can use the {Owner} as the value you need, see: Add requester to Administrator Group of Windows VM in vCAC 6 – VMtoCloud.com