The only help I can offer is my thoughts that any decent size city will have a HARDWARE shop where they mostly sell nuts, bolts, screws, etc as their main business, they probably carry all that most would need. For the time being, can you cut a slot with a hack saw so you can use a small straight screwdriver or maybe its not worth the effort for a temp fix. They will need to know some info about the screw if you talk with them over the phone, such as the length, thread pitch, style of head (maybe countersunk?), T5 drive, type of metal, etc.
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