I once set 5 sails at the same time on my Arpege in the 70s. It is called good fun and learning about sail handling. You might also try a mizzen on a boat hook from one of the back stays and a spanker set below the boom.
Forget about all these purists and instruction books. Go for it. Choose a calmish day and enjoy but remember that you have to get them in again if the wind comes up.