How about climbing up to where it is 7-10 inches, then guying it with two- three lines. Then reach up with a pole saw and limb as much as you can reach. top it, using and open face, and no lowering line.
I've worked on only a couple incense cedar, not sure how much strength the wood fiber would have. Take up a drill and test the trunk in a few spots.
We're halfway through doing a 90 foot big leaf maple, stone dead for 3 plus years. Bark off at the bottom, and peeling everywhere. Amazing dust clouds when chipping..and the peely, fluffy bark gets blown back out the load.
We guyed all the tops together at 55 feet. Tree is between two houses, so we plywooded each roof edge. We free dropped some branches, lowered others..and have actually been able to tie in at 60 feet, and have about half the top out. The 17 ton boom truck is coming tomorrow with 85 foot of stick, so we should finish in a 2-3 hours.
Then we go to crane one long lateral elm leader from over a house, plus two more picks. Job number three is a 70 foot quite dead 32 inch dbh hemlock with spreading canopy, and near the primaries. It is in a cemetary, so we have to lay some plywood to drive over a few headstones..will crane that one, branches on, in three picks. Then we have three doug fir sticks, 30, 85 and 85 feet high, on two different job sites to pick out..and sell to the mill. So, it will be a busy day!!! As was today, with the elm and maple.
Photos will follow. You'll have to go to Arborist site, where I might be able to post a couple videos.