I think this is an amazing idea! I am struggling with a similar situation now.
Anything that will allow to semi-automate this, and get a periodic report that compares this to where the Single Point of Truth for the account list would be amazing.
>>dbdosk+(OP)
Great to see that we were not alone with the struggles! Let me know if you are up for a quick chat. Would love to learn more about your situation and how OpenOwl could help fix it. If you are up for it, my contact is in the bio