Troubleshooting Alias Management: Deleting and Updating User Profiles

I'm running into some issues surrounding the use of aliases, and I haven't been able to get anyone from support on the line, I'm hoping someone here knows: is there any way to delete an alias? Once an alias is created is there any way to send events and/or profile updates to the user profile that existed before the alias was put in place? I found that the profile deletion API endpoint has an $ignore_alias option, do other endpoints have that option, that might not be documented?