I think you saw the brooch bouquet I am making, most of the brooches I used either don't have backings or I used pretty earrings. I attached them to a 22 gauge wire that you find at stores like Hobby Lobby. There really is no right way to do this, you just have to have patience and a lot of hot glue
, but it's doable to affix the Mickey earrings to one or two of those gauge wires and then wrap the whole thing with green corsage tape for a finish look like I am doing with mine. You just have to wrap the wire around the earring post and if there is no post create a hole of hot glue and stick the wire in there and twist it into a stem and then add more glue to secure it after that you cover the whole thing with the corsage tape to make a clean stem. If you're interested I can send you more detailed instructions on how to do it, just let me know