Taking out the ignition barrel helps in one of two ways only. A...they decide to do the fiddly thing, try and see which wafers are set in the current configuration, pull the code from those numbers, cut a key and hope to god they were right. B, they cut a new key and change the wafers in every lock on the car to match the new key...handy if ur key has been stolen, does no good if u try and get a pre-cut key from nissan as the code will no longer be right for that vehicle. Expect to pay through the teeth to re-key your entire vehicle. thats at least 2 hours labour IF they work hard on it.
As per Kris' above comments...the drivers side door lock is the only lock with the correct code stamped into the tail piece of the lock. Keying it to the boot will not achieve anything but a nice new boot key. Your best bet is to exorcise the drivers side door lock - because trust me getting it out seems like a pain but will save you time, money and grief in the meantime.
Or hell...you could go to Nissan and ask them to ship you a new pre-cut key overnight from Japan