Set Mac address of vCloud VM

Hi

For a customer I need to regularly clone a production VM into vCloud for a test-environment. The VM needs to have an identical Mac Address because of some old-fashioned licenses. After cloning, the Is there a way I can easily set the Mac address of the VM to the original Mac Address? Even if the VMs is in the same vCenter environment, but different cluster of ESXi hosts.

Gabrie