stripped screws on the bottom of the iPhone 11

I have an iPhone 11 which is my daily driver, I disliked the color so I bought a used black housing to swap the internals to the new housing, I started unscrewing one of the screws on the bottom but it instantly became rounded off and stripped, I then started the other one only for that one to break half way out, I don’t know what to do here, I think ill flatten the sides of the half out screw in order to use tweezers to twist it out but with the one that still stuck I think ill use a small drill bit and go in reverse and try to use the drill bit to bite into the screw to get it out, if there’s anything else to try please inform me, I have used the right screw and all the elastic band and glue tricks