If that doesn't work try forcing a 2.5mm, or oversize fractional or Torx key into the stripped-out drive recess. You could also epoxy a sacrificial hex key in, remove the screw and replace it. There are also available left-hand drills https://www.harborfreight.com/left-h...-pc-61686.html you could use to drill out and replace it, or re-tap to a larger size if there is room.