Clemens, modify the "gear lever knob" method.
stretch some sprue, smaller than the rivets you want
snip off a good end to start with,,,,,,,hold a match up in front of the sprue end, careful not to touch the sprue
slice off the ball end it makes, that is your new rivet,,,,,,,,snip off a clean end and repeat
I suggest doing 2, 3 or more sprue pieces in a batch, so you don't spend the rest of your life waiting for heat, but, it could go as fast as "hold it up there, put that one down, get the next,,,,,,,,etc",,,,,,,then slice each half round off and snip for the next "melt"