If you have non-security T6 and T7s, carefully drill away the middle of the screw with a very small bit, stopping frequently to vacuum out the filings to see if you’ve done enough. You don’t need to do much, and too much will strip the screw entirely. Then very carefully unscrew using a T6 (you may need a T7). I’ve done it twice and it works.
Galvanic, it pops in.
GalvanicMacPro, to my recollection, the plate needs to be more fully inserted before all screws will line up again.
When replacing the keyboard ribbon, place a rubber band between the ribbon and your spudger to get the traction for a good connection.