Why not?!! Absolutely. There’s no impediment or barrier to that for you, is there? Something I’m not aware of?
look at dhgate you will find 2 types. One with a fixed insert and another with 3 different inserts. I have both which you can see in my photos. All the inserts are only about 50mm long and very comfortable to wear. However I have not been able to use the 12mm dia insert yet as I need to stretch more before I can insert it.