Only heat will break the epoxy loose, as the screw slot and screwdriver can't apply enough force without damage. Hopefully you can heat it enough without damaging the blue.
Have a gunsmith install a stud, as the Older Rugers had, and as the Colt has (or had). The stud, silver soldered in, will take the shear force under recoil, so the screw only has to hold the housing to the stud. It must still be checked for tightness, as a loose housing can still shoot off a stud.
Note that Story sells both kinds of housing, cut for the stud, and not, and for two different screw head sizes. If you have the Story you shot off, it can be modified to fit over a stud.
If you install a stud, you'll have to reblue, anyway.