Combine Music Play action with Play Ringtone action
How about adding option in the Music Play action to choose an internal ringtone from the ringtones/notifications menu of the device?
There is the Play Ringtone action but as you know it can do a lot of harm (less funny) when you get loop of audio playing. I would even suggest to remove it completely and adding all the options to the Music Play action but i know you afraid of breaking stuff for users.