Yes, you could. It will become a little soggy in the soap though, so make the bits as tiny as possible.
Use a glass Pyrex measuring "cup" for melting in your microwave. Take it out as soon as the glycerin is all melted (because if you overheat it, it develops a bad odor).
Use fragrance...
There are two methods to make soap:
1. Melt & pour glycerine soap - very easy, pretty, perfect for a casual hobby.
2. Lye based "cold process" soap - complicated, dangerous, great for a serious hobby in which you become qualified for an advanced degree in Industrial Chemisty.
(I do melt &...