@Antenor I use a rivet maker similar to this process. Although I typically just crudely shove leftover green stuff into it and let it cure with a thumb print wad on the back. Then I cut the individual rivets off the wad as I need them. I have tried it with some old oven bake that I had around the house and it worked okay. Although some rivets deformed since I peeled the mold off before baking. Applying them is delicate but with a dot of glue and a slightly wet blade to pick up the rivet and place it I’ve had decent luck.