This is interesting as I plan to fit smooth top screw/rivets (though not hollow).
My plan is to use a piece of pliable rubber to hold the screw under thumb pressure whilst tightening with a spanner.
Perhaps you could try the reverse to get yours off. The secret is finding "the right type" of rubber which when pressed hard against the rivet is grippy enough to stop it rotating. Pressing hard with your thumb should then do the trick.
Mike
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