Bill, if you can get someone to work with you to get the air hose on a gaff and both of you can move quickly, I think you could drop paint from the outboard at the edge to inside center, then scoot around and go inside/center to outside, and stay wet enough that she'll blend. Then do a wet "drop coat" from a step ladder as quick as you can. Having the "gaffer" keep you from bellyflopping on the roof.
The "sky crane" was sort of in jest. Being around military Corrosion Control (aircraft paint shop), I have seen some "things".
I shot and "washed off" (hot reducer) my dash, four times, before I was happy with it. (Single stage, metallic).
A lot changed in 40 years from my last painting escapades, and I sorta liked the "old school" ways of many things.