My guess is it would be cheaper to rip the roof off, add structure to bring the wall up to 9'10", and put new trusses and new roof on. Adding a pony wall and attempting to raise the whole thing up, and replacing the trusses one by one(was that the idea?), would be more work than just putting a new roof on it.
One thing you need to watch out for is there is also a maximum peak height, I think under 14', so you need to make sure you don't hit that.
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