So you're saying this person wants a ghost of the current running system? Aren't you concerned with your personal information? Every modern HP including the ZD8000 comes with recovery discs in case of a crash or simply to start from scratch. Unless this person is a good friend of yours, why wouldn't you do a simple factory restore? See if I was worried about personal information (as if I sold a laptop on eBay), what I personally would do is #1, backup all my docs, settings, data, etc. #2: make sure I have the recovery discs for the system then #3: (totally optional) Use
Killdisk and wipe the drive clean. The FREE version allows one pass but some will argue that you should run it 3 to 7 times. Some will argue that 3 is enough and others stick to the DoD standard of 7. Anyhow #4: After the wipe, then restore the factory discs. Now the system is really brand new without any reasonably restorability of your previous OS and especially private data.
You won't have to worry about the OEM license being a problem. It will still live on the same machine it was intended for. Just tell your buyer to never try to restore the ghost on any other computer.