How can I deal with a low spot in a fiberglass shower pan?
autobody filler might work out you can put a real thin layer of it then sculpt it with a sander then finish it off with enamel paint, assuming this is a fiberglass pan.  Make sure you don't create a slippery surface though.  Another way would be to remove the glass wall and completely resculpt this with filler than put down tile mastic and tile it with traditional grout including a new higher lip.  Then reinstall the glass frame.  I agree with you I would not start a project to tear out the pan.