I have relied on a program called Project Sweeper for years to clean-up annotative items / standards in projects. The program makes managing model standards simple allowing one to purge unwanted items and convert to existing standards in the model. This is particularly useful to convert standards when models are shared from past projects.
The program is no longer supported and I would like to suggest building this into the next Revit version.
https://apps.autodesk.com/RVT/en/Detail/Index?id=6695458069304097371&appLang=en&os=Win64