The next decision is really important
Sorta depends on just how close the crane can get in.
I have used a crane 4 times in the last 12 years, so when I use a crane, it is very, very necessary.
Junkie, your trunk is very, very VERY necessary.
Have the crane in to do the lift. You've busted your butt on this monster. Dicing that trunk into quads, or pie wedges or whatever is going to KICK ANYONE'S tush. Pay the crane for the lift and be done.
Scenario:
If you were to remove some adjacent deck boards, you could cut the stump below the level of the deck. You could do this and cut 75% of the way through the base before the crane even shows up. Get power blown and cleaned up, and when the crane shows up, make the last 25% of the cut, and YOU GUYS WIN. Crane is in and out in an hour.
This is just me talking. I had a biggie last year that required a lull. I've had a number of big trunks where I shoulda had a crane, but didn't, and I usually got pounded on an hour for hour, dollar for dollar basis. But, you have the deck there, making the call to crane it out almost a decision easily made for you.
You mention the crane at $200 an hour. What are the costs of your crew? Let's say $200 an hour for all of you, the trucks, insurances, rent a scaffold, blah blah. With the crane, in the span of two hours, (two hours for the crew, one hour with the crane) you're rollin off to the next job. Cost $600 and you have the rest of your day
If you get your a$$ whooped for six hours of cutting and moving wood, and another hour to clean up the 700 pounds of sawdust, 7 hours total, cost $1,400 and your day is eaten.
Crane make you money on this one, AND will make the finishing of this beast smooth and swift.
That is all from me.