No, there's no access from the top.

I went to the local bike store and they strongly threaded in an M3 bolt, but could not extract the pin by pulling on it. They tried 40 minutes. They think it's corroded or bent into the cam cylinder since wiggling the bolt when it's in the pin will turn the lever back and forth. They tried WD40 on it too.

I'm thinking of tapping it with M3 and pulling on the tap itself, but I'm worried about getting the tap stuck inside and then I won't be able to insert the safety set screw that's supposed to prevent the pin from falling out.

The plan was to open it up to see why the play in the hinge has developed and whether replacing the pin would help any. I also thought about wrapping the pivot pins (the large pins that are fixed to the frame) with adhesive aluminum foil 0.05-0.1mm thick would reduce the play. But I think the foil would probably rip apart.

Maybe I should leave it as it is.