I have tried the air chisel, but at least the one I had, a really nice Snap-on, was not as good as the big hammer and chisel. The air chisel stretched the holes more than the big hammer and chisel.
the air hammer with a punch tool did work pretty slick for punching them out though.
I was concerned with damaging things because I did reuse most all of the holes.

I think it's been said before, but no one way works all the time.
Best to have a a few plans of attack for those stubborn or hard to get to rivets.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-