Is this an ExtendScript possibility: change tags based on Level?

Some specifics: I have run-in head paragraph tags used throughout the book going from Level1Tag1Run all the way to Level6Tag 3Run (and maybe beyond), and most of them have a line after it (FederalRegistry) which has In Column formats. I have styles set up for this item (FedLevel2Tag1, etc) but the file that I was sent has every instance of that item coming in with FederalRegistry and not the correct Level tags. Is there a way to automate a global change so that whenever that kind of tag is following, say, a Level3 paragraph tag, that it switches to the FedLevel3 tag? Is that something I would need Extend Script to do? Or is that beyond automation? (Attached image key: Yellow Highlight is Level5Tag1Run, Blue Highlight is FederalRegister but SHOULD be FedLevel5Tag2)