Everything that Coolsport is saying is on the money. But, it sounds like way too much work.
If your P2V fails, normally it will not break the original server. VMWARE makes things easier....not harder.
Personally, if I have another DC floating around you can always just seize the roles. Or instead of doing authoritative restores and stuff, I would just install the VM operating system and DCpromo the VM. Then you can manually transfer the roles or just l run DC promo the original server. This should automatically transfer the roles from the physical server to the VM.
As long as you have at least one DC available , you should be able to seize the roles and get AD working again.
