All,
I was able to resolve this via GEL. I created a script that identifies all instances based on a process name. Then for each instance that gets returned, I delete all the escalations, run objects and processes/sub-processes from the system. I have attached a copy of the script for anyone who would have a need to do the same.
*** Note - I based this script off of the CA delivered Delete Process Instance job. That process chooses instances to delete by status. This one does it based on specific process names. If you need to choose what instances to delete based on status, you'll need to add that to the script.