Hi Cannon, as I've said on another thread here somewhere dead trees are extremely dangerous, climbing them even more so...based on the photos you posted I would have to spend an hour or more working out how to manage the likelihood of the entire stem failing on me if I began climbing it!
Unless there was a larger stablle tree above it, or I could rig myself off a crane I wouldn't climb it at all....not even to fell the top half.
Scaffold might be an option, or a small mobile crane, either way doubt the client is going to be wild about the price! Cheapest option is as Ekka suggests remove fence and fell..then rake and rake and rake.