So you've got a time constraint, a contract that says "by 1600 Weds. or no $$$" ?
Have we got it straight ?
You're a smart guy, so think forces and trigonometry like space shots or artillery. A 2 ton cable up 20' on a __ ' tall tree. Then add the moment arm
(length of force ) @ 50+ mph gusts in "foot-pounds". Just off the top off my dumba$$ brain
, that's some weight way up there to hold some dinky cable, held by an even dinkier holding point. And it will all be in motion.
Then there's this tiny tiny wood hinge that may or may not hold with all that sway. Then you got "direction of fall" aimed where you think it will go. Then another gust = more ft-lbs moving the mother where you don't want it.
Just say "no". Hey, we could take up a collection here to beat the silly 'customer' putting silly constraints on you. $$ is worth the risk ?
And all for a "view"
. We want this gibone's name, SS#, tel, address. Some winner.
JMNSHO