Hi Mark, I was thinking to do the same with open silicone molds or 2 halves silicone molds. With silicone I don't think that it's necessary a carrirer, it should be sufficient to sponge the powder upon its surface. Instead with alluminium molds It could be useful to appl, with a brush, paper glue from a stick. In past I used paper stick glue to fix inside mold's inner sides the mylar net.
Bye Cami