An impact screw driver will also likely solve the problem. Their advantage is that they simultaneously seat the bit into the screw head and apply a torque to the screw. One only needs to break the fastener loose with a couple of degrees of rotation, then leaning on a manual or motorized driver will turn the screw out without the bit walking up out of the head. And they are a lot less expensive than a rivet gun plus torque tool if you don't already have the gun in your tool box.
https://www.harborfreight.com/impact...ase-37530.html
https://www.mcmaster.com/impact-scre...crewdrivers-5/