Could you rent a boom lift and reach it like that? I used one to do some work on a steep roof on a garage I built with a 10/12 roof.
Probably, but I'm not comfortable with this kind of install myself. I do a lot of DIY things, but I'm not sure cutting 8-10" holes through my roof or walls is within my comfort zone. Heights and I don't particularly get along. Getting on top of the 30' masonry chimney for the first year cleaning the chimney (before I started doing bottom-up cleaning) was interesting and terrifying to say the least.
Tax money is in, so next weekend I'm selling my tractor that I hardly use and starting to get bids.