We use these a lot...
https://www.unitedrentals.com/market...lift-150-4wd#/ Not necessarily from this supplier, but you get the idea.
They will operate on some nasty terrain, even as steep as Thomas', tho' I suspect with this 'big-lift' the difficulty will be maneuvering thru the trees? ...but maybe?
Crane and a basket?? Helo? Where there's a will, there's a way.
Thomas, sorry if this seems too flippant. I have had contractors that are gems, and some are warts. Seems like we share that.