Mr Crudley
Glock in your sock
There is an utter bastard of a honeysuckle next door that borgs anything it grows over.That’s similar to what I was thinking, insulate the outside of the roof with something lightweight or grow a fast moving vining plant over the top.
I've hit it with nasty stuff now but considering a flamethrower if it still grows. I can snip off some a post to you if you are keen. This thing will grow fast and into every nook it can find.
A friend of mine has solar panels recently installed and mentioned the same temperature decrease due to the big arsed panels.