agree with above, should be able to drill out with common tools you already have..
grind the head flat, make a good center punch, and progressively drill out until enough material is relieved to punch out..
an air chisel may work for you in low clearance positions where you can't attach the stud straight on..
we punch loose hucks out of truck and crane outrigger frame mounts frequently at work..
and replace them with tru-torq high strength bolts that can be re-tightened on inspection
I have this
CP 717 super duty air hammer with quick change chuck and decent assortment of chisels kept very sharp..
it makes short work cutting heavy duty hucks, rivets, bolts, nuts, etc.. but please wear your PPE!
good luck!
