So, you want to be able to use both the white and green items as bolo ties. You can attach the bolo tie hardware to the back of both the white and green items, allowing you to switch them out. The tie can be easily removed. However, in that case, you won't be able to attach brooch hardware to the back. If you use brooch hardware like the one in the image, you can use it as both a brooch and a bolo tie. You will need to switch it out each time. Also, the bolo tie hardware might make it stick out a bit...